diff --git a/js/swad15.111.js b/js/swad15.111.js
index 2ae166346..13aa5537c 100644
--- a/js/swad15.111.js
+++ b/js/swad15.111.js
@@ -20,6 +20,8 @@
     You should have received a copy of the GNU Affero General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
+"use strict";
+
 // Global variable (string) used to write HTML
 var Gbl_HTMLContent;
 
diff --git a/swad_action.c b/swad_action.c
index 6789096be..0384674d7 100644
--- a/swad_action.c
+++ b/swad_action.c
@@ -4311,36 +4311,52 @@ char *Act_GetActionTextFromDB (long ActCod,char *Txt)
 /******************************** Start a form *******************************/
 /*****************************************************************************/
 
-void Act_FormStart (Act_Action_t NextAction)
-  {
-   Gbl.NumForm++; // Initialized to -1. The first time it is incremented, it will be equal to 0
-   sprintf (Gbl.FormId,"form_%d",Gbl.NumForm);
-   Act_FormStartInternal (NextAction,true,Gbl.FormId,NULL);	// Do put now parameter location (if no open session)
-  }
-
 void Act_FormGoToStart (Act_Action_t NextAction)
   {
-   Gbl.NumForm++; // Initialized to -1. The first time it is incremented, it will be equal to 0
-   sprintf (Gbl.FormId,"form_%d",Gbl.NumForm);
-   Act_FormStartInternal (NextAction,false,Gbl.FormId,NULL);	// Do not put now parameter location
+   Gbl.Form.Num++; // Initialized to -1. The first time it is incremented, it will be equal to 0
+   sprintf (Gbl.Form.Id,"form_%d",Gbl.Form.Num);
+   Act_FormStartInternal (NextAction,false,Gbl.Form.Id,NULL);	// Do not put now parameter location
+  }
+
+void Act_FormStart (Act_Action_t NextAction)
+  {
+   Gbl.Form.Num++; // Initialized to -1. The first time it is incremented, it will be equal to 0
+   sprintf (Gbl.Form.Id,"form_%d",Gbl.Form.Num);
+   Act_FormStartInternal (NextAction,true,Gbl.Form.Id,NULL);	// Do put now parameter location (if no open session)
+  }
+
+void Act_FormStartUnique (Act_Action_t NextAction)
+  {
+   Gbl.Form.Num++; // Initialized to -1. The first time it is incremented, it will be equal to 0
+   sprintf (Gbl.Form.UniqueId,"form_%s_%d",
+            Gbl.UniqueNameEncrypted,Gbl.Form.Num);
+   Act_FormStartInternal (NextAction,true,Gbl.Form.UniqueId,NULL);	// Do put now parameter location (if no open session)
   }
 
 void Act_FormStartAnchor (Act_Action_t NextAction,const char *Anchor)
   {
-   Gbl.NumForm++; // Initialized to -1. The first time it is incremented, it will be equal to 0
-   sprintf (Gbl.FormId,"form_%d",Gbl.NumForm);
-   Act_FormStartInternal (NextAction,true,Gbl.FormId,Anchor);	// Do put now parameter location (if no open session)
+   Gbl.Form.Num++; // Initialized to -1. The first time it is incremented, it will be equal to 0
+   sprintf (Gbl.Form.Id,"form_%d",Gbl.Form.Num);
+   Act_FormStartInternal (NextAction,true,Gbl.Form.Id,Anchor);	// Do put now parameter location (if no open session)
+  }
+
+void Act_FormStartUniqueAnchor (Act_Action_t NextAction,const char *Anchor)
+  {
+   Gbl.Form.Num++; // Initialized to -1. The first time it is incremented, it will be equal to 0
+   sprintf (Gbl.Form.UniqueId,"form_%s_%d",
+            Gbl.UniqueNameEncrypted,Gbl.Form.Num);
+   Act_FormStartInternal (NextAction,true,Gbl.Form.UniqueId,Anchor);	// Do put now parameter location (if no open session)
   }
 
 void Act_FormStartId (Act_Action_t NextAction,const char *Id)
   {
-   Gbl.NumForm++; // Initialized to -1. The first time it is incremented, it will be equal to 0
+   Gbl.Form.Num++; // Initialized to -1. The first time it is incremented, it will be equal to 0
    Act_FormStartInternal (NextAction,true,Id,NULL);	// Do put now parameter location (if no open session)
   }
 
 void Act_FormStartIdAnchor (Act_Action_t NextAction,const char *Id,const char *Anchor)
   {
-   Gbl.NumForm++; // Initialized to -1. The first time it is incremented, it will be equal to 0
+   Gbl.Form.Num++; // Initialized to -1. The first time it is incremented, it will be equal to 0
    Act_FormStartInternal (NextAction,true,Id,Anchor);	// Do put now parameter location (if no open session)
   }
 
@@ -4350,7 +4366,7 @@ static void Act_FormStartInternal (Act_Action_t NextAction,bool PutParameterLoca
    extern const char *Txt_STR_LANG_ID[1+Txt_NUM_LANGUAGES];
    char Params[256+256+Ses_LENGTH_SESSION_ID+256];
 
-   if (!Gbl.InsideForm)
+   if (!Gbl.Form.Inside)
      {
       /* Start form */
       fprintf (Gbl.F.Out,"<form method=\"post\" action=\"%s/%s",
@@ -4377,7 +4393,7 @@ static void Act_FormStartInternal (Act_Action_t NextAction,bool PutParameterLoca
       Act_SetParamsForm (Params,NextAction,PutParameterLocationIfNoSesion);
       fprintf (Gbl.F.Out,"%s",Params);
 
-      Gbl.InsideForm = true;
+      Gbl.Form.Inside = true;
      }
   }
 
@@ -4425,10 +4441,10 @@ void Act_SetParamsForm (char *Params,Act_Action_t NextAction,bool PutParameterLo
 
 void Act_FormEnd (void)
   {
-   if (Gbl.InsideForm)
+   if (Gbl.Form.Inside)
      {
       fprintf (Gbl.F.Out,"</form>");
-      Gbl.InsideForm = false;
+      Gbl.Form.Inside = false;
      }
   }
 
@@ -4439,7 +4455,12 @@ void Act_FormEnd (void)
 
 void Act_LinkFormSubmit (const char *Title,const char *LinkStyle)
   {
-   Act_LinkFormSubmitId (Title,LinkStyle,Gbl.FormId);
+   Act_LinkFormSubmitId (Title,LinkStyle,Gbl.Form.Id);
+  }
+
+void Act_LinkFormSubmitUnique (const char *Title,const char *LinkStyle)
+  {
+   Act_LinkFormSubmitId (Title,LinkStyle,Gbl.Form.UniqueId);
   }
 
 // Title can be NULL
@@ -4474,9 +4495,9 @@ void Act_LinkFormSubmitAnimated (const char *Title,const char *LinkStyle)
 		      "document.getElementById('updating_%d').style.display='';"	// Icon to be shown on click
 		      "document.getElementById('%s').submit();"
 		      "return false;\">",
-	    Gbl.NumForm,
-	    Gbl.NumForm,
-	    Gbl.FormId);
+	    Gbl.Form.Num,
+	    Gbl.Form.Num,
+	    Gbl.Form.Id);
   }
 
 /*****************************************************************************/
diff --git a/swad_action.h b/swad_action.h
index 025d88201..e2d46e086 100644
--- a/swad_action.h
+++ b/swad_action.h
@@ -1425,14 +1425,17 @@ const char *Act_GetSubtitleAction (Act_Action_t Action);
 void Act_GetBreadcrumbStrForAction (Act_Action_t Action,bool HTML,char *BreadcrumbStr);
 char *Act_GetActionTextFromDB (long ActCod,char *Txt);
 
-void Act_FormStart (Act_Action_t NextAction);
 void Act_FormGoToStart (Act_Action_t NextAction);
+void Act_FormStart (Act_Action_t NextAction);
+void Act_FormStartUnique (Act_Action_t NextAction);
 void Act_FormStartAnchor (Act_Action_t NextAction,const char *Anchor);
+void Act_FormStartUniqueAnchor (Act_Action_t NextAction,const char *Anchor);
 void Act_FormStartId (Act_Action_t NextAction,const char *Id);
 void Act_FormStartIdAnchor (Act_Action_t NextAction,const char *Id,const char *Anchor);
 void Act_SetParamsForm (char *Params,Act_Action_t NextAction,bool PutParameterLocationIfNoSesion);
 void Act_FormEnd (void);
 void Act_LinkFormSubmit (const char *Title,const char *LinkStyle);
+void Act_LinkFormSubmitUnique (const char *Title,const char *LinkStyle);
 void Act_LinkFormSubmitId (const char *Title,const char *LinkStyle,const char *Id);
 void Act_LinkFormSubmitAnimated (const char *Title,const char *LinkStyle);
 
diff --git a/swad_assignment.c b/swad_assignment.c
index 25866f9f9..9205dab77 100644
--- a/swad_assignment.c
+++ b/swad_assignment.c
@@ -375,7 +375,7 @@ static void Asg_WriteAsgAuthor (struct Assignment *Asg)
    /***** Show photo *****/
    Pho_ShowUsrPhoto (&UsrDat,ShowPhoto ? PhotoURL :
                 	                 NULL,
-	             "PHOTO15x20",Pho_ZOOM,NULL);
+	             "PHOTO15x20",Pho_ZOOM,false);
 
    /***** Write name *****/
    strcpy (FirstName,UsrDat.FirstName);
diff --git a/swad_attendance.c b/swad_attendance.c
index 605e15835..b72cda7b4 100644
--- a/swad_attendance.c
+++ b/swad_attendance.c
@@ -414,7 +414,7 @@ static void Att_WriteAttEventAuthor (struct AttendanceEvent *Att)
    /***** Show photo *****/
    Pho_ShowUsrPhoto (&UsrDat,ShowPhoto ? PhotoURL :
                 	                 NULL,
-                     "PHOTO15x20",Pho_ZOOM,NULL);
+                     "PHOTO15x20",Pho_ZOOM,false);
 
    /***** Write name *****/
    strcpy (FirstName,UsrDat.FirstName);
@@ -1973,7 +1973,7 @@ static void Att_WriteRowStdToCallTheRoll (unsigned NumStd,struct UsrData *UsrDat
       ShowPhoto = Pho_ShowUsrPhotoIsAllowed (UsrDat,PhotoURL);
       Pho_ShowUsrPhoto (UsrDat,ShowPhoto ? PhotoURL :
                                            NULL,
-                        "PHOTO45x60",Pho_ZOOM,NULL);
+                        "PHOTO45x60",Pho_ZOOM,false);
       fprintf (Gbl.F.Out,"</td>");
      }
 
@@ -3188,7 +3188,7 @@ static void Att_WriteRowStdSeveralAttEvents (unsigned NumStd,struct UsrData *Usr
       ShowPhoto = Pho_ShowUsrPhotoIsAllowed (UsrDat,PhotoURL);
       Pho_ShowUsrPhoto (UsrDat,ShowPhoto ? PhotoURL :
                                            NULL,
-                        "PHOTO21x28",Pho_ZOOM,NULL);
+                        "PHOTO21x28",Pho_ZOOM,false);
       fprintf (Gbl.F.Out,"</td>");
      }
 
@@ -3326,7 +3326,7 @@ static void Att_ListAttEventsForAStd (unsigned NumStd,struct UsrData *UsrDat)
    ShowPhoto = Pho_ShowUsrPhotoIsAllowed (UsrDat,PhotoURL);
    Pho_ShowUsrPhoto (UsrDat,ShowPhoto ? PhotoURL :
 				        NULL,
-		     "PHOTO21x28",Pho_ZOOM,NULL);
+		     "PHOTO21x28",Pho_ZOOM,false);
    fprintf (Gbl.F.Out,"</td>");
 
    /***** Write user's ID ******/
diff --git a/swad_banner.c b/swad_banner.c
index ac9543ce5..d643a0425 100644
--- a/swad_banner.c
+++ b/swad_banner.c
@@ -359,7 +359,7 @@ static void Ban_ListBannersForEdition (void)
 	                 " maxlength=\"%u\" value=\"%s\""
                          " class=\"INPUT_SHORT_NAME\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
-               Ban_MAX_LENGTH_SHORT_NAME,Ban->ShortName,Gbl.FormId);
+               Ban_MAX_LENGTH_SHORT_NAME,Ban->ShortName,Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -371,7 +371,7 @@ static void Ban_ListBannersForEdition (void)
 	                 " maxlength=\"%u\" value=\"%s\""
                          " class=\"INPUT_FULL_NAME\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
-               Ban_MAX_LENGTH_FULL_NAME,Ban->FullName,Gbl.FormId);
+               Ban_MAX_LENGTH_FULL_NAME,Ban->FullName,Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -382,7 +382,7 @@ static void Ban_ListBannersForEdition (void)
       fprintf (Gbl.F.Out,"<input type=\"text\" name=\"Img\""
 	                 " size=\"12\" maxlength=\"%u\" value=\"%s\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
-               Ban_MAX_LENGTH_IMAGE,Ban->Img,Gbl.FormId);
+               Ban_MAX_LENGTH_IMAGE,Ban->Img,Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -394,7 +394,7 @@ static void Ban_ListBannersForEdition (void)
 	                 " maxlength=\"%u\" value=\"%s\""
                          " class=\"INPUT_WWW\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
-               Cns_MAX_LENGTH_WWW,Ban->WWW,Gbl.FormId);
+               Cns_MAX_LENGTH_WWW,Ban->WWW,Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>"
                          "</tr>");
diff --git a/swad_centre.c b/swad_centre.c
index d99e93fde..2f917ea76 100644
--- a/swad_centre.c
+++ b/swad_centre.c
@@ -351,7 +351,7 @@ static void Ctr_Configuration (bool PrintView)
 	    Act_FormStart (ActChgCtrPhoAtt);
 	    fprintf (Gbl.F.Out,"<textarea name=\"Attribution\" cols=\"50\" rows=\"2\""
 			       " onchange=\"document.getElementById('%s').submit();\">",
-		     Gbl.FormId);
+		     Gbl.Form.Id);
             if (PhotoAttribution)
 	       fprintf (Gbl.F.Out,"%s",PhotoAttribution);
 	    fprintf (Gbl.F.Out,"</textarea>");
@@ -1139,7 +1139,7 @@ void Ctr_WriteSelectorOfCentre (void)
    fprintf (Gbl.F.Out,"<select name=\"ctr\" style=\"width:175px;\"");
    if (Gbl.CurrentIns.Ins.InsCod > 0)
       fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
-               Gbl.FormId);
+               Gbl.Form.Id);
    else
       fprintf (Gbl.F.Out," disabled=\"disabled\"");
    fprintf (Gbl.F.Out,"><option value=\"\"");
@@ -1268,7 +1268,7 @@ static void Ctr_ListCentresForEdition (void)
 	 Ctr_PutParamOtherCtrCod (Ctr->CtrCod);
 	 fprintf (Gbl.F.Out,"<select name=\"OthInsCod\" style=\"width:62px;\""
 			    " onchange=\"document.getElementById('%s').submit();\">",
-		  Gbl.FormId);
+		  Gbl.Form.Id);
 	 for (NumIns = 0;
 	      NumIns < Gbl.Inss.Num;
 	      NumIns++)
@@ -1292,7 +1292,7 @@ static void Ctr_ListCentresForEdition (void)
 	 Ctr_PutParamOtherCtrCod (Ctr->CtrCod);
 	 fprintf (Gbl.F.Out,"<select name=\"PlcCod\" style=\"width:62px;\""
 			    " onchange=\"document.getElementById('%s').submit();\">",
-		  Gbl.FormId);
+		  Gbl.Form.Id);
 	 fprintf (Gbl.F.Out,"<option value=\"0\"");
 	 if (Ctr->PlcCod == 0)
 	    fprintf (Gbl.F.Out," selected=\"selected\"");
@@ -1326,7 +1326,7 @@ static void Ctr_ListCentresForEdition (void)
 	                    " maxlength=\"%u\" value=\"%s\""
                             " class=\"INPUT_SHORT_NAME\""
 			    " onchange=\"document.getElementById('%s').submit();\" />",
-		  Ctr_MAX_LENGTH_CENTRE_SHORT_NAME,Ctr->ShortName,Gbl.FormId);
+		  Ctr_MAX_LENGTH_CENTRE_SHORT_NAME,Ctr->ShortName,Gbl.Form.Id);
 	 Act_FormEnd ();
 	 fprintf (Gbl.F.Out,"</td>");
 	}
@@ -1344,7 +1344,7 @@ static void Ctr_ListCentresForEdition (void)
 	                    " maxlength=\"%u\" value=\"%s\""
                             " class=\"INPUT_FULL_NAME\""
 			    " onchange=\"document.getElementById('%s').submit();\" />",
-		  Ctr_MAX_LENGTH_CENTRE_FULL_NAME,Ctr->FullName,Gbl.FormId);
+		  Ctr_MAX_LENGTH_CENTRE_FULL_NAME,Ctr->FullName,Gbl.Form.Id);
 	 Act_FormEnd ();
 	 fprintf (Gbl.F.Out,"</td>");
 	}
@@ -1362,7 +1362,7 @@ static void Ctr_ListCentresForEdition (void)
 	                    " maxlength=\"%u\" value=\"%s\""
                             " class=\"INPUT_WWW\""
 			    " onchange=\"document.getElementById('%s').submit();\" />",
-		  Cns_MAX_LENGTH_WWW,Ctr->WWW,Gbl.FormId);
+		  Cns_MAX_LENGTH_WWW,Ctr->WWW,Gbl.Form.Id);
 	 Act_FormEnd ();
 	}
       else
@@ -1408,7 +1408,7 @@ static void Ctr_ListCentresForEdition (void)
 			    "<option value=\"%u\" selected=\"selected\">%s</option>"
 			    "<option value=\"%u\">%s</option>"
 			    "</select>",
-		  Gbl.FormId,
+		  Gbl.Form.Id,
 		  (unsigned) Ctr_GetStatusBitsFromStatusTxt (Ctr_STATUS_PENDING),
 		  Txt_CENTRE_STATUS[Ctr_STATUS_PENDING],
 		  (unsigned) Ctr_GetStatusBitsFromStatusTxt (Ctr_STATUS_ACTIVE),
diff --git a/swad_changelog.h b/swad_changelog.h
index d0a55eb5d..16b30fa8e 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -121,18 +121,21 @@
 // TODO: Limit text of post/comment in social timeline to 1000 characters? Limit textarea to 20 lines not resizeable.
 // TODO: Sinchronize timeline in other actions
 // TODO: Optimize Javascript not concatenating big strings in new timeline
+// TODO: Do not put divs to get new publishings in user's timeline
 
 /*****************************************************************************/
 /****************************** Public constants *****************************/
 /*****************************************************************************/
 
-#define Log_PLATFORM_VERSION	"SWAD 15.112 (2016-01-14)"
+#define Log_PLATFORM_VERSION	"SWAD 15.113 (2016-01-14)"
 #define CSS_FILE		"swad15.111.css"
 #define JS_FILE			"swad15.111.js"
 
 // Number of lines (includes comments but not blank lines) has been got with the following command:
 // nl swad*.c swad*.h css/swad*.css py/swad*.py js/swad*.js soap/swad*.h sql/swad*.sql | tail -1
 /*
+        Version 15.113:   Jan 14, 2016	Code refactoring related to forms with unique identifiers.
+					Use unique identifiers in forms of lists of connected users. (192680 lines)
         Version 15.112:   Jan 14, 2016	Fixed bugs in user's timeline.
 					All forms in social timeline must have unique identifiers. (192676 lines)
         Version 15.111:   Jan 14, 2016	Fixed bug in user's timeline.
diff --git a/swad_connected.c b/swad_connected.c
index 40874ad65..9ef273b24 100644
--- a/swad_connected.c
+++ b/swad_connected.c
@@ -672,12 +672,13 @@ static void Con_ShowConnectedUsrsWithARoleBelongingToCurrentLocationOnRightColum
    /***** Write message with number of users not listed *****/
    if (Gbl.Usrs.Connected.NumUsrsToList < Gbl.Usrs.Connected.NumUsrs)
      {
-      sprintf (Gbl.FormId,"form_con_%d",++Gbl.NumFormConnectedUsrs);
       fprintf (Gbl.F.Out,"<tr>"
 			 "<td colspan=\"3\" class=\"CENTER_TOP\">");
-      Act_FormStartId (ActLstCon,Gbl.FormId);
+      Act_FormStartUnique (ActLstCon);	// Must be unique because
+					// the list of connected users
+					// is dynamically updated via AJAX
       Sco_PutParamScope (Sco_SCOPE_CRS);
-      Act_LinkFormSubmitId (Txt_Connected_users,The_ClassConnected[Gbl.Prefs.Theme],Gbl.FormId);
+      Act_LinkFormSubmitUnique (Txt_Connected_users,The_ClassConnected[Gbl.Prefs.Theme]);
       fprintf (Gbl.F.Out,"<img src=\"%s/ellipsis32x32.gif\""
 	                 " alt=\"%s\" title=\"%s\" class=\"ICON40x40\" />"
 	                 "</a>",
@@ -1072,14 +1073,15 @@ static void Con_WriteRowConnectedUsrOnRightColumn (Rol_Role_t Role)
 	              "<td class=\"LEFT_MIDDLE COLOR%u\""
 	              " style=\"width:22px;\">",
 	    Gbl.RowEvenOdd);
-   sprintf (Gbl.FormId,"form_con_%d",++Gbl.NumFormConnectedUsrs);
-   Act_FormStartId (ActSeePubPrf,Gbl.FormId);
+   Act_FormStartUnique (ActSeePubPrf);	// Must be unique because
+					// the list of connected users
+					// is dynamically updated via AJAX
    Usr_PutParamUsrCodEncrypted (UsrDat.EncryptedUsrCod);
-   Act_LinkFormSubmitId (UsrDat.FullName,NULL,Gbl.FormId);
+   Act_LinkFormSubmitUnique (UsrDat.FullName,NULL);
    ShowPhoto = Pho_ShowUsrPhotoIsAllowed (&UsrDat,PhotoURL);
    Pho_ShowUsrPhoto (&UsrDat,ShowPhoto ? PhotoURL :
                 	                 NULL,
-                     "PHOTO21x28",Pho_ZOOM,NULL);
+                     "PHOTO21x28",Pho_ZOOM,false);
    fprintf (Gbl.F.Out,"</a>");
    Act_FormEnd ();
    fprintf (Gbl.F.Out,"</td>");
@@ -1088,12 +1090,12 @@ static void Con_WriteRowConnectedUsrOnRightColumn (Rol_Role_t Role)
    fprintf (Gbl.F.Out,"<td class=\"%s LEFT_MIDDLE COLOR%u\""
 	              " style=\"width:68px;\">",
 	    Font,Gbl.RowEvenOdd);
-   sprintf (Gbl.FormId,"form_con_%d",++Gbl.NumFormConnectedUsrs);
-   Act_FormStartId ((Role == Rol_STUDENT) ? ActSeeRecOneStd :
-	                                    ActSeeRecOneTch,
-	            Gbl.FormId);
+   Act_FormStartUnique ((Role == Rol_STUDENT) ? ActSeeRecOneStd :
+	                                        ActSeeRecOneTch);	// Must be unique because
+									// the list of connected users
+									// is dynamically updated via AJAX
    Usr_PutParamUsrCodEncrypted (UsrDat.EncryptedUsrCod);
-   Act_LinkFormSubmitId (Txt_View_record_for_this_course,Font,Gbl.FormId);
+   Act_LinkFormSubmitUnique (Txt_View_record_for_this_course,Font);
    Usr_RestrictLengthAndWriteName (&UsrDat,8);
    fprintf (Gbl.F.Out,"</a>");
    Act_FormEnd ();
@@ -1271,7 +1273,7 @@ static void Con_ShowConnectedUsrsCurrentLocationOneByOneOnMainZone (Rol_Role_t R
 	    ShowPhoto = Pho_ShowUsrPhotoIsAllowed (&UsrDat,PhotoURL);
 	    Pho_ShowUsrPhoto (&UsrDat,ShowPhoto ? PhotoURL :
 						  NULL,
-			      "PHOTO21x28",Pho_ZOOM,NULL);
+			      "PHOTO21x28",Pho_ZOOM,false);
 	    fprintf (Gbl.F.Out,"</td>");
 
 	    /***** Write full name and link *****/
diff --git a/swad_country.c b/swad_country.c
index 8a40234cd..6234cb6a9 100644
--- a/swad_country.c
+++ b/swad_country.c
@@ -275,7 +275,7 @@ static void Cty_Configuration (bool PrintView)
 	    Act_FormStart (ActChgCtyMapAtt);
 	    fprintf (Gbl.F.Out,"<textarea name=\"Attribution\" cols=\"50\" rows=\"2\""
 			       " onchange=\"document.getElementById('%s').submit();\">",
-		     Gbl.FormId);
+		     Gbl.Form.Id);
             if (MapAttribution)
 	       fprintf (Gbl.F.Out,"%s",MapAttribution);
 	    fprintf (Gbl.F.Out,"</textarea>");
@@ -1053,7 +1053,7 @@ void Cty_WriteSelectorOfCountry (void)
    fprintf (Gbl.F.Out,"<select name=\"cty\" style=\"width:175px;\""
                       " onchange=\"document.getElementById('%s').submit();\">"
                       "<option value=\"\"",
-	    Gbl.FormId);
+	    Gbl.Form.Id);
    if (Gbl.CurrentCty.Cty.CtyCod < 0)
       fprintf (Gbl.F.Out," selected=\"selected\"");
    fprintf (Gbl.F.Out," disabled=\"disabled\">[%s]</option>",
@@ -1106,7 +1106,7 @@ void Cty_WriteCountryName (long CtyCod,const char *Class)
    /***** Get country name *****/
    Cty_GetCountryName (CtyCod,CtyName);
 
-   if (Gbl.InsideForm)	// If we are writing another form
+   if (Gbl.Form.Inside)	// If we are writing another form
       /***** Write country name without link *****/
       fprintf (Gbl.F.Out,"%s",CtyName);
    else
@@ -1456,7 +1456,7 @@ static void Cty_ListCountriesForEdition (void)
                             " size=\"15\" maxlength=\"%u\" value=\"%s\""
                             " onchange=\"document.getElementById('%s').submit();\" />",
                   Cty_MAX_BYTES_COUNTRY_NAME,
-                  Cty->Name[Lan],Gbl.FormId);
+                  Cty->Name[Lan],Gbl.Form.Id);
          Act_FormEnd ();
          fprintf (Gbl.F.Out,"</td>");
 
@@ -1470,7 +1470,7 @@ static void Cty_ListCountriesForEdition (void)
                             " class=\"INPUT_WWW\""
                             " onchange=\"document.getElementById('%s').submit();\" />",
                   Cty_MAX_LENGTH_COUNTRY_WWW,
-                  Cty->WWW[Lan],Gbl.FormId);
+                  Cty->WWW[Lan],Gbl.Form.Id);
          Act_FormEnd ();
          fprintf (Gbl.F.Out,"</td>"
                             "</tr>");
diff --git a/swad_course.c b/swad_course.c
index 545c98ada..8b95548ed 100644
--- a/swad_course.c
+++ b/swad_course.c
@@ -892,7 +892,7 @@ void Crs_WriteSelectorOfCourse (void)
    fprintf (Gbl.F.Out,"<select name=\"crs\" style=\"width:175px;\"");
    if (Gbl.CurrentDeg.Deg.DegCod > 0)
       fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
-               Gbl.FormId);
+               Gbl.Form.Id);
    else
       fprintf (Gbl.F.Out," disabled=\"disabled\"");
    fprintf (Gbl.F.Out,"><option value=\"\"");
@@ -1090,7 +1090,7 @@ void Crs_WriteSelectorMyCourses (void)
    fprintf (Gbl.F.Out,"<select name=\"CrsCod\""
 	              " style=\"width:130px; margin:1px;\""
                       " onchange=\"document.getElementById('%s').submit();\">",
-            Gbl.FormId);
+            Gbl.Form.Id);
 
    /***** Write an option when no course selected *****/
    if (Gbl.CurrentCrs.Crs.CrsCod <= 0)
@@ -1410,7 +1410,7 @@ static void Crs_ListCoursesForEdition (void)
                                   " onchange=\"document.getElementById('%s').submit();\" />",
                         Crs_LENGTH_INSTITUTIONAL_CRS_COD,
                         Crs->InstitutionalCrsCod,
-                        Gbl.FormId);
+                        Gbl.Form.Id);
                Act_FormEnd ();
               }
             else
@@ -1426,7 +1426,7 @@ static void Crs_ListCoursesForEdition (void)
                fprintf (Gbl.F.Out,"<select name=\"OthDegCod\""
         	                  " class=\"INPUT_DEGREE\""
         	                  " onchange=\"document.getElementById('%s').submit();\">",
-                        Gbl.FormId);
+                        Gbl.Form.Id);
                for (NumDeg = 0;
         	    NumDeg < Gbl.Usrs.Me.MyAdminDegs.Num;
         	    NumDeg++)
@@ -1451,7 +1451,7 @@ static void Crs_ListCoursesForEdition (void)
                fprintf (Gbl.F.Out,"<select name=\"OthCrsYear\""
         	                  " style=\"width:50px;\""
         	                  " onchange=\"document.getElementById('%s').submit();\">",
-                        Gbl.FormId);
+                        Gbl.Form.Id);
                for (YearAux = 0;
         	    YearAux <= Deg_MAX_YEARS_PER_DEGREE;
         	    YearAux++)	// All the years are permitted because it's possible to move this course to another degree (with other active years)
@@ -1478,7 +1478,7 @@ static void Crs_ListCoursesForEdition (void)
                                   " class=\"INPUT_SHORT_NAME\""
                                   " onchange=\"document.getElementById('%s').submit();\" />",
                         Crs_MAX_LENGTH_COURSE_SHORT_NAME,Crs->ShortName,
-                        Gbl.FormId);
+                        Gbl.Form.Id);
                Act_FormEnd ();
               }
             else
@@ -1496,7 +1496,7 @@ static void Crs_ListCoursesForEdition (void)
                                   " class=\"INPUT_FULL_NAME\""
                                   " onchange=\"document.getElementById('%s').submit();\" />",
                         Crs_MAX_LENGTH_COURSE_FULL_NAME,Crs->FullName,
-                        Gbl.FormId);
+                        Gbl.Form.Id);
                Act_FormEnd ();
               }
             else
@@ -1528,7 +1528,7 @@ static void Crs_ListCoursesForEdition (void)
                                   "<option value=\"%u\" selected=\"selected\">%s</option>"
                                   "<option value=\"%u\">%s</option>"
                                   "</select>",
-                        Gbl.FormId,
+                        Gbl.Form.Id,
                         (unsigned) Crs_GetStatusBitsFromStatusTxt (Crs_STATUS_PENDING),
                         Txt_COURSE_STATUS[Crs_STATUS_PENDING],
                         (unsigned) Crs_GetStatusBitsFromStatusTxt (Crs_STATUS_ACTIVE),
diff --git a/swad_date.c b/swad_date.c
index 25498e986..5129b740a 100644
--- a/swad_date.c
+++ b/swad_date.c
@@ -334,7 +334,7 @@ void Dat_WriteFormClientLocalDateTimeFromTimeUTC (const char *Id,
 	    Id,ParamName,Id,Id);
    if (SubmitFormOnChange)
       fprintf (Gbl.F.Out,"document.getElementById('%s').submit();",
-               Gbl.FormId);
+               Gbl.Form.Id);
    fprintf (Gbl.F.Out,"\">");
    for (Year = FirstYear;
 	Year <= LastYear;
@@ -353,7 +353,7 @@ void Dat_WriteFormClientLocalDateTimeFromTimeUTC (const char *Id,
 	    Id,ParamName,Id,Id);
    if (SubmitFormOnChange)
       fprintf (Gbl.F.Out,"document.getElementById('%s').submit();",
-               Gbl.FormId);
+               Gbl.Form.Id);
    fprintf (Gbl.F.Out,"\">");
    for (Month = 1;
 	Month <= 12;
@@ -370,7 +370,7 @@ void Dat_WriteFormClientLocalDateTimeFromTimeUTC (const char *Id,
             Id,ParamName,Id);
    if (SubmitFormOnChange)
       fprintf (Gbl.F.Out,"document.getElementById('%s').submit();",
-               Gbl.FormId);
+               Gbl.Form.Id);
    fprintf (Gbl.F.Out,"\">");
    for (Day = 1;
 	Day <= 31;
@@ -387,7 +387,7 @@ void Dat_WriteFormClientLocalDateTimeFromTimeUTC (const char *Id,
             Id,ParamName,Id);
    if (SubmitFormOnChange)
       fprintf (Gbl.F.Out,"document.getElementById('%s').submit();",
-               Gbl.FormId);
+               Gbl.Form.Id);
    fprintf (Gbl.F.Out,"\">");
    for (Hour = 0;
 	Hour <= 23;
@@ -404,7 +404,7 @@ void Dat_WriteFormClientLocalDateTimeFromTimeUTC (const char *Id,
 	    Id,ParamName,Id);
    if (SubmitFormOnChange)
       fprintf (Gbl.F.Out,"document.getElementById('%s').submit();",
-               Gbl.FormId);
+               Gbl.Form.Id);
    fprintf (Gbl.F.Out,"\">");
    for (Minute = 0;
 	Minute <= 59;
@@ -421,7 +421,7 @@ void Dat_WriteFormClientLocalDateTimeFromTimeUTC (const char *Id,
 	    Id,ParamName,Id);
    if (SubmitFormOnChange)
       fprintf (Gbl.F.Out,"document.getElementById('%s').submit();",
-               Gbl.FormId);
+               Gbl.Form.Id);
    fprintf (Gbl.F.Out,"\">");
    for (Second = 0;
 	Second <= 59;
@@ -581,7 +581,7 @@ void Dat_WriteFormDate (unsigned FirstYear,unsigned LastYear,
 	    Id,Id,Id);
    if (SubmitFormOnChange)
       fprintf (Gbl.F.Out,"document.getElementById('%s').submit();",
-               Gbl.FormId);
+               Gbl.Form.Id);
    fprintf (Gbl.F.Out,"\"");
    if (Disabled)
       fprintf (Gbl.F.Out," disabled=\"disabled\"");
@@ -605,7 +605,7 @@ void Dat_WriteFormDate (unsigned FirstYear,unsigned LastYear,
 	    Id,Id,Id);
    if (SubmitFormOnChange)
       fprintf (Gbl.F.Out,"document.getElementById('%s').submit();",
-               Gbl.FormId);
+               Gbl.Form.Id);
    fprintf (Gbl.F.Out,"\"");
    if (Disabled)
       fprintf (Gbl.F.Out," disabled=\"disabled\"");
@@ -628,7 +628,7 @@ void Dat_WriteFormDate (unsigned FirstYear,unsigned LastYear,
             Id,Id);
    if (SubmitFormOnChange)
       fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
-               Gbl.FormId);
+               Gbl.Form.Id);
    if (Disabled)
       fprintf (Gbl.F.Out," disabled=\"disabled\"");
    fprintf (Gbl.F.Out,"><option value=\"0\">-</option>");
diff --git a/swad_degree.c b/swad_degree.c
index 1d206d7ae..06090e832 100644
--- a/swad_degree.c
+++ b/swad_degree.c
@@ -593,7 +593,7 @@ static void Deg_WriteSelectorOfDegree (void)
    fprintf (Gbl.F.Out,"<select name=\"deg\" style=\"width:175px;\"");
    if (Gbl.CurrentCtr.Ctr.CtrCod > 0)
       fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
-               Gbl.FormId);
+               Gbl.Form.Id);
    else
       fprintf (Gbl.F.Out," disabled=\"disabled\"");
    fprintf (Gbl.F.Out,"><option value=\"\"");
@@ -1277,7 +1277,7 @@ static void Deg_ListDegreeTypesForEdition (void)
                          " onchange=\"document.getElementById('%s').submit();\" />",
                Deg_MAX_LENGTH_DEGREE_TYPE_NAME,
                Gbl.Degs.DegTypes.Lst[NumDegTyp].DegTypName,
-               Gbl.FormId);
+               Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -1289,7 +1289,7 @@ static void Deg_ListDegreeTypesForEdition (void)
                          " onchange=\"document.getElementById('%s').submit();\" />",
                Gbl.Degs.DegTypes.Lst[NumDegTyp].AllowDirectLogIn ? " checked=\"checked\"" :
         	                                                   "",
-               Gbl.FormId);
+               Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -1500,7 +1500,7 @@ static void Deg_ListDegreesForEdition (void)
 	 Deg_PutParamOtherDegCod (Deg->DegCod);
 	 fprintf (Gbl.F.Out,"<select name=\"OthCtrCod\" style=\"width:62px;\""
 			    " onchange=\"document.getElementById('%s').submit();\">",
-		  Gbl.FormId);
+		  Gbl.Form.Id);
 	 for (NumCtr = 0;
 	      NumCtr < Gbl.Ctrs.Num;
 	      NumCtr++)
@@ -1526,7 +1526,7 @@ static void Deg_ListDegreesForEdition (void)
 	                    " maxlength=\"%u\" value=\"%s\""
                             " class=\"INPUT_SHORT_NAME\""
 			    " onchange=\"document.getElementById('%s').submit();\" />",
-		  Deg_MAX_LENGTH_DEGREE_SHORT_NAME,Deg->ShortName,Gbl.FormId);
+		  Deg_MAX_LENGTH_DEGREE_SHORT_NAME,Deg->ShortName,Gbl.Form.Id);
 	 Act_FormEnd ();
 	}
       else
@@ -1543,7 +1543,7 @@ static void Deg_ListDegreesForEdition (void)
 	                    " maxlength=\"%u\" value=\"%s\""
                             " class=\"INPUT_FULL_NAME\""
 			    " onchange=\"document.getElementById('%s').submit();\" />",
-		  Deg_MAX_LENGTH_DEGREE_FULL_NAME,Deg->FullName,Gbl.FormId);
+		  Deg_MAX_LENGTH_DEGREE_FULL_NAME,Deg->FullName,Gbl.Form.Id);
 	 Act_FormEnd ();
 	}
       else
@@ -1559,7 +1559,7 @@ static void Deg_ListDegreesForEdition (void)
 	 fprintf (Gbl.F.Out,"<select name=\"OthDegTypCod\""
 	                    " style=\"width:62px;\""
 			    " onchange=\"document.getElementById('%s').submit();\">",
-		  Gbl.FormId);
+		  Gbl.Form.Id);
 	 for (NumDegTyp = 0;
 	      NumDegTyp < Gbl.Degs.DegTypes.Num;
 	      NumDegTyp++)
@@ -1590,7 +1590,7 @@ static void Deg_ListDegreesForEdition (void)
 	 Deg_PutParamOtherDegCod (Deg->DegCod);
 	 fprintf (Gbl.F.Out,"<select name=\"FirstYear\""
 			    " onchange=\"document.getElementById('%s').submit();\">",
-		  Gbl.FormId);
+		  Gbl.Form.Id);
 	 for (Year = 0;
 	      Year <= Deg_MAX_YEARS_PER_DEGREE;
 	      Year++)
@@ -1614,7 +1614,7 @@ static void Deg_ListDegreesForEdition (void)
 	 Deg_PutParamOtherDegCod (Deg->DegCod);
 	 fprintf (Gbl.F.Out,"<select name=\"LastYear\""
 			    " onchange=\"document.getElementById('%s').submit();\">",
-		  Gbl.FormId);
+		  Gbl.Form.Id);
 	 for (Year = 0;
 	      Year <= Deg_MAX_YEARS_PER_DEGREE;
 	      Year++)
@@ -1640,7 +1640,7 @@ static void Deg_ListDegreesForEdition (void)
 	                    " maxlength=\"%u\" value=\"%s\""
                             " class=\"INPUT_WWW\""
 			    " onchange=\"document.getElementById('%s').submit();\" />",
-		  Cns_MAX_LENGTH_WWW,Deg->WWW,Gbl.FormId);
+		  Cns_MAX_LENGTH_WWW,Deg->WWW,Gbl.Form.Id);
 	 Act_FormEnd ();
 	}
       else
@@ -1675,7 +1675,7 @@ static void Deg_ListDegreesForEdition (void)
 			    "<option value=\"%u\" selected=\"selected\">%s</option>"
 			    "<option value=\"%u\">%s</option>"
 			    "</select>",
-		  Gbl.FormId,
+		  Gbl.Form.Id,
 		  (unsigned) Deg_GetStatusBitsFromStatusTxt (Deg_STATUS_PENDING),
 		  Txt_DEGREE_STATUS[Deg_STATUS_PENDING],
 		  (unsigned) Deg_GetStatusBitsFromStatusTxt (Deg_STATUS_ACTIVE),
diff --git a/swad_department.c b/swad_department.c
index 65753a5c2..a06b5475b 100644
--- a/swad_department.c
+++ b/swad_department.c
@@ -531,7 +531,7 @@ static void Dpt_ListDepartmentsForEdition (void)
       fprintf (Gbl.F.Out,"<select name=\"OthInsCod\" style=\"width:62px;\""
 	                 "onchange=\"document.getElementById('%s').submit();\">"
                          "<option value=\"0\"",
-	       Gbl.FormId);
+	       Gbl.Form.Id);
       if (Dpt->InsCod == 0)
          fprintf (Gbl.F.Out," selected=\"selected\"");
       fprintf (Gbl.F.Out,">%s</option>",Txt_Another_institution);
@@ -555,7 +555,7 @@ static void Dpt_ListDepartmentsForEdition (void)
 	                 " maxlength=\"%u\" value=\"%s\""
                          " class=\"INPUT_SHORT_NAME\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
-               MAX_LENGTH_DEPARTMENT_SHORT_NAME,Dpt->ShortName,Gbl.FormId);
+               MAX_LENGTH_DEPARTMENT_SHORT_NAME,Dpt->ShortName,Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -567,7 +567,7 @@ static void Dpt_ListDepartmentsForEdition (void)
 	                 " maxlength=\"%u\" value=\"%s\""
                          " class=\"INPUT_FULL_NAME\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
-               MAX_LENGTH_DEPARTMENT_FULL_NAME,Dpt->FullName,Gbl.FormId);
+               MAX_LENGTH_DEPARTMENT_FULL_NAME,Dpt->FullName,Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -579,7 +579,7 @@ static void Dpt_ListDepartmentsForEdition (void)
 	                 " maxlength=\"%u\" value=\"%s\""
                          " class=\"INPUT_WWW\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
-               Cns_MAX_LENGTH_WWW,Dpt->WWW,Gbl.FormId);
+               Cns_MAX_LENGTH_WWW,Dpt->WWW,Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
diff --git a/swad_enrollment.c b/swad_enrollment.c
index 1cc990af8..ae2a31228 100644
--- a/swad_enrollment.c
+++ b/swad_enrollment.c
@@ -2785,7 +2785,7 @@ void Enr_ShowEnrollmentRequests (void)
             ShowPhoto = Pho_ShowUsrPhotoIsAllowed (&UsrDat,PhotoURL);
             Pho_ShowUsrPhoto (&UsrDat,ShowPhoto ? PhotoURL :
                         	                  NULL,
-                              "PHOTO21x28",Pho_ZOOM,NULL);
+                              "PHOTO21x28",Pho_ZOOM,false);
             fprintf (Gbl.F.Out,"</td>");
 
             /***** User name *****/
diff --git a/swad_file_browser.c b/swad_file_browser.c
index 6d1762df0..3e57dd0c3 100644
--- a/swad_file_browser.c
+++ b/swad_file_browser.c
@@ -3124,7 +3124,7 @@ static void Brw_FormToChangeCrsGrpZone (void)
    fprintf (Gbl.F.Out," onclick=\"document.getElementById('%s').submit();\" />"
                       "%s"
                       "</li>",
-            Gbl.FormId,
+            Gbl.Form.Id,
             Gbl.CurrentCrs.Crs.FullName);
 
    /***** List my groups for unique selection *****/
@@ -3157,7 +3157,7 @@ static void Brw_FormToChangeCrsGrpZone (void)
 	 fprintf (Gbl.F.Out," onclick=\"document.getElementById('%s').submit();\" />"
 			    "%s %s"
 			    "</li>",
-		  Gbl.FormId,
+		  Gbl.Form.Id,
                   GrpDat.GrpTypName,GrpDat.GrpName);
         }
 
@@ -3213,7 +3213,7 @@ static void Brw_ShowDataOwnerAsgWrk (struct UsrData *UsrDat)
    ShowPhoto = Pho_ShowUsrPhotoIsAllowed (UsrDat,PhotoURL);
    Pho_ShowUsrPhoto (UsrDat,ShowPhoto ? PhotoURL :
                 	                NULL,
-                     "PHOTO93x124",Pho_ZOOM,NULL);
+                     "PHOTO93x124",Pho_ZOOM,false);
    fprintf (Gbl.F.Out,"</td>");
 
    /***** Start form to send a message to this user *****/
@@ -4425,7 +4425,7 @@ static void Brw_WriteFormFullTree (void)
       fprintf (Gbl.F.Out," checked=\"checked\"");
    fprintf (Gbl.F.Out," onclick=\"document.getElementById('%s').submit();\" />"
                       " %s",
-            Gbl.FormId,
+            Gbl.Form.Id,
             Txt_Show_all_files);
    Act_FormEnd ();
    fprintf (Gbl.F.Out,"</div>");
@@ -5700,7 +5700,7 @@ static void Brw_WriteFileName (unsigned Level,bool IsPublic,Brw_FileType_t FileT
 		  FileName,Gbl.FileBrowser.InputStyle,
                   Gbl.FileBrowser.Clipboard.IsThisFile ? "LIGHT_GREEN" :
                 	                                 Gbl.ColorRows[Gbl.RowEvenOdd],
-                  Gbl.FormId);
+                  Gbl.Form.Id);
          Act_FormEnd ();
         }
       else
@@ -5958,7 +5958,7 @@ static void Brw_WriteFileOrFolderPublisher (unsigned Level,unsigned long UsrCod)
       ShowPhoto = Pho_ShowUsrPhotoIsAllowed (&UsrDat,PhotoURL);
       Pho_ShowUsrPhoto (&UsrDat,ShowPhoto ? PhotoURL :
                                             NULL,
-                        "PHOTO15x20B",Pho_ZOOM,NULL);
+                        "PHOTO15x20B",Pho_ZOOM,false);
      }
    else
       fprintf (Gbl.F.Out,"<img src=\"%s/usr_bl.jpg\""
@@ -7835,7 +7835,7 @@ static void Brw_PutFormToUploadFilesUsingDropzone (const char *FileNameToShow)
 
    /***** Form to upload files using the library Dropzone.js *****/
    // Use min-height:125px; or other number to stablish the height?
-   Gbl.NumForm++;
+   Gbl.Form.Num++;
    fprintf (Gbl.F.Out,"<form method=\"post\" action=\"%s/%s\""
                       " class=\"dropzone\""
                       " enctype=\"multipart/form-data\""
@@ -9051,7 +9051,7 @@ void Brw_ShowFileMetadata (void)
 	    ShowPhoto = Pho_ShowUsrPhotoIsAllowed (&PublisherUsrDat,PhotoURL);
 	    Pho_ShowUsrPhoto (&PublisherUsrDat,ShowPhoto ? PhotoURL :
 	                	                           NULL,
-	                      "PHOTO15x20",Pho_ZOOM,NULL);
+	                      "PHOTO15x20",Pho_ZOOM,false);
 
 	    /* Write name */
 	    fprintf (Gbl.F.Out,"%s",
diff --git a/swad_follow.c b/swad_follow.c
index c8ea2be89..cab79702d 100644
--- a/swad_follow.c
+++ b/swad_follow.c
@@ -488,7 +488,7 @@ static void Fol_ShowFollowedOrFollower (const struct UsrData *UsrDat)
       ShowPhoto = Pho_ShowUsrPhotoIsAllowed (UsrDat,PhotoURL);
       Pho_ShowUsrPhoto (UsrDat,ShowPhoto ? PhotoURL :
 					   NULL,
-			"PHOTO45x60",Pho_ZOOM,NULL);
+			"PHOTO45x60",Pho_ZOOM,false);
      }
    fprintf (Gbl.F.Out,"</td>");
 
diff --git a/swad_forum.c b/swad_forum.c
index 10d8c5973..467e51545 100644
--- a/swad_forum.c
+++ b/swad_forum.c
@@ -1786,7 +1786,7 @@ static void For_PutFormWhichForums (void)
       fprintf (Gbl.F.Out," onclick=\"document.getElementById('%s').submit();\" />"
 	                 "%s"
                          "</li>",
-               Gbl.FormId,Txt_FORUM_WHICH_FORUM[WhichForums]);
+               Gbl.Form.Id,Txt_FORUM_WHICH_FORUM[WhichForums]);
      }
    fprintf (Gbl.F.Out,"</ul>"
 	              "</div>");
diff --git a/swad_global.c b/swad_global.c
index 6799ac802..b995275c7 100644
--- a/swad_global.c
+++ b/swad_global.c
@@ -108,9 +108,8 @@ void Gbl_InitializeGlobals (void)
    Gbl.F.Tmp = NULL;
    Gbl.F.XML = NULL;
 
-   Gbl.InsideForm = false;		// Set to true inside a form to avoid nested forms
-   Gbl.NumForm = -1;			// Number of form. It's increased by 1 at the begin of each form
-   Gbl.NumFormConnectedUsrs = -1;	// Number of form in list of connected users. It's increased by 1 at the begin of each form
+   Gbl.Form.Num = -1;			// Number of form. It's increased by 1 at the begin of each form
+   Gbl.Form.Inside = false;		// Set to true inside a form to avoid nested forms
 
    Gbl.Error = false;
 
diff --git a/swad_global.h b/swad_global.h
index 4ee752597..43fa58a12 100644
--- a/swad_global.h
+++ b/swad_global.h
@@ -86,10 +86,13 @@ struct Globals
    struct Files F;
    MYSQL mysql;
    pid_t PID;	// PID of current process
-   bool InsideForm;		// Set to true inside a form to avoid nested forms
-   int NumForm;			// Number of form, used in form submit links
-   int NumFormConnectedUsrs;	// Number of form in list of connected users, used in form submit links
-   char FormId[32];		// Identifier string used in forms
+   struct
+     {
+      int Num;			// Number of form, used in form submit links
+      char Id[32];		// Identifier string used in forms
+      char UniqueId[32+Cry_LENGTH_ENCRYPTED_STR_SHA256_BASE64+10+1];	// Unique identifier string used in forms
+      bool Inside;		// Set to true inside a form to avoid nested forms
+     } Form;
    bool Error;
    bool GetMethod;	// Am I accessed using GET method?
    struct soap *soap;	// gSOAP runtime environment
diff --git a/swad_group.c b/swad_group.c
index 2f0f9454f..e823d4db4 100644
--- a/swad_group.c
+++ b/swad_group.c
@@ -1153,7 +1153,7 @@ static void Grp_ListGroupTypesForEdition (void)
                          " onchange=\"document.getElementById('%s').submit();\" />",
                MAX_LENGTH_GROUP_TYPE_NAME,
                Gbl.CurrentCrs.Grps.GrpTypes.LstGrpTypes[NumGrpTyp].GrpTypName,
-               Gbl.FormId);
+               Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -1165,7 +1165,7 @@ static void Grp_ListGroupTypesForEdition (void)
 	                 " style=\"width:150px;\""
 	                 " onchange=\"document.getElementById('%s').submit();\">"
                          "<option value=\"N\"",
-               Gbl.FormId);
+               Gbl.Form.Id);
       if (!Gbl.CurrentCrs.Grps.GrpTypes.LstGrpTypes[NumGrpTyp].MandatoryEnrollment)
 	 fprintf (Gbl.F.Out," selected=\"selected\"");
       fprintf (Gbl.F.Out,">%s</option>"
@@ -1187,7 +1187,7 @@ static void Grp_ListGroupTypesForEdition (void)
 	                 " style=\"width:150px;\""
 	                 " onchange=\"document.getElementById('%s').submit();\">"
                          "<option value=\"N\"",
-               Gbl.FormId);
+               Gbl.Form.Id);
       if (!Gbl.CurrentCrs.Grps.GrpTypes.LstGrpTypes[NumGrpTyp].MultipleEnrollment)
 	 fprintf (Gbl.F.Out," selected=\"selected\"");
       fprintf (Gbl.F.Out,">%s</option>"
@@ -1371,7 +1371,7 @@ static void Grp_ListGroupsForEdition (void)
          Grp_PutParamGrpCod (Grp->GrpCod);
          fprintf (Gbl.F.Out,"<select name=\"GrpTypCod\""
                             " onchange=\"document.getElementById('%s').submit();\">",
-                  Gbl.FormId);
+                  Gbl.Form.Id);
          for (NumTipGrpAux = 0;
               NumTipGrpAux < Gbl.CurrentCrs.Grps.GrpTypes.Num;
               NumTipGrpAux++)
@@ -1393,7 +1393,7 @@ static void Grp_ListGroupsForEdition (void)
          fprintf (Gbl.F.Out,"<input type=\"text\" name=\"GrpName\""
                             " size=\"40\" maxlength=\"%u\" value=\"%s\""
                             " onchange=\"document.getElementById('%s').submit();\" />",
-                  MAX_LENGTH_GROUP_NAME,Grp->GrpName,Gbl.FormId);
+                  MAX_LENGTH_GROUP_NAME,Grp->GrpName,Gbl.Form.Id);
          Act_FormEnd ();
          fprintf (Gbl.F.Out,"</td>");
 
@@ -1405,7 +1405,7 @@ static void Grp_ListGroupsForEdition (void)
                             " size=\"3\" maxlength=\"10\" value=\"");
          Grp_WriteMaxStdsGrp (Grp->MaxStudents);
          fprintf (Gbl.F.Out,"\" onchange=\"document.getElementById('%s').submit();\" />",
-                  Gbl.FormId);
+                  Gbl.Form.Id);
          Act_FormEnd ();
          fprintf (Gbl.F.Out,"</td>");
 
@@ -4179,7 +4179,7 @@ void Grp_ShowSelectorWhichGrps (void)
       fprintf (Gbl.F.Out," onclick=\"document.getElementById('%s').submit();\" />"
                          " %s"
                          "</li>",
-               Gbl.FormId,Txt_Show_WHICH_groups[WhichGrps]);
+               Gbl.Form.Id,Txt_Show_WHICH_groups[WhichGrps]);
      }
    fprintf (Gbl.F.Out,"</ul>"
                       "</div>");
diff --git a/swad_holiday.c b/swad_holiday.c
index 2bf57b69e..abc05469e 100644
--- a/swad_holiday.c
+++ b/swad_holiday.c
@@ -508,7 +508,7 @@ static void Hld_ListHolidaysForEdition (void)
       fprintf (Gbl.F.Out,"<select name=\"PlcCod\" style=\"width:62px;\""
 	                 " onchange=\"document.getElementById('%s').submit();\">"
                          "<option value=\"-1\"",
-	       Gbl.FormId);
+	       Gbl.Form.Id);
       if (Hld->PlcCod <= 0)
          fprintf (Gbl.F.Out," selected=\"selected\"");
       fprintf (Gbl.F.Out,">%s</option>",Txt_All_places);
@@ -530,7 +530,7 @@ static void Hld_ListHolidaysForEdition (void)
       Hld_PutParamHldCod (Hld->HldCod);
       fprintf (Gbl.F.Out,"<select name=\"HldTyp\" style=\"width:62px;\""
 	                 " onchange=\"document.getElementById('%s').submit();\">",
-	       Gbl.FormId);
+	       Gbl.Form.Id);
       for (HolidayType = (Hld_HolidayType_t) 0;
 	   HolidayType < Hld_NUM_TYPES_HOLIDAY;
 	   HolidayType++)
@@ -574,7 +574,7 @@ static void Hld_ListHolidaysForEdition (void)
       fprintf (Gbl.F.Out,"<input type=\"text\" name=\"Name\""
 	                 " size=\"20\" maxlength=\"%u\" value=\"%s\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
-               Hld_MAX_LENGTH_HOLIDAY_NAME,Hld->Name,Gbl.FormId);
+               Hld_MAX_LENGTH_HOLIDAY_NAME,Hld->Name,Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>"
                          "</tr>");
diff --git a/swad_info.c b/swad_info.c
index bf1ba8625..3e775931b 100644
--- a/swad_info.c
+++ b/swad_info.c
@@ -440,7 +440,7 @@ static void Inf_PutFormToForceStdsToReadInfo (Inf_InfoType_t InfoType,bool MustB
    fprintf (Gbl.F.Out," name=\"MustBeRead\" value=\"Y\""
                       " onchange=\"document.getElementById('%s').submit();\" />"
                       " %s",
-            Gbl.FormId,
+            Gbl.Form.Id,
             Txt_Force_students_to_read_this_information);
    Act_FormEnd ();
    fprintf (Gbl.F.Out,"</div>");
@@ -465,7 +465,7 @@ static void Inf_PutFormToConfirmIHaveReadInfo (Inf_InfoType_t InfoType)
    fprintf (Gbl.F.Out," name=\"IHaveRead\" value=\"Y\""
                       " onchange=\"document.getElementById('%s').submit();\" />"
                       "%s",
-            Gbl.FormId,
+            Gbl.Form.Id,
             Txt_I_have_read_this_information);
    Act_FormEnd ();
    fprintf (Gbl.F.Out,"</div>");
@@ -952,7 +952,7 @@ void Inf_FormsToSelSendInfo (void)
       if (InfoSrc == InfoSrcSelected)
          fprintf (Gbl.F.Out," checked=\"checked\"");
       fprintf (Gbl.F.Out," onclick=\"document.getElementById('%s').submit();\" />",
-               Gbl.FormId);
+               Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
diff --git a/swad_institution.c b/swad_institution.c
index 725953652..ffb2e9d92 100644
--- a/swad_institution.c
+++ b/swad_institution.c
@@ -1055,7 +1055,7 @@ void Ins_WriteSelectorOfInstitution (void)
    fprintf (Gbl.F.Out,"<select name=\"ins\" style=\"width:175px;\"");
    if (Gbl.CurrentCty.Cty.CtyCod > 0)
       fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
-               Gbl.FormId);
+               Gbl.Form.Id);
    else
       fprintf (Gbl.F.Out," disabled=\"disabled\"");
    fprintf (Gbl.F.Out,"><option value=\"\"");
@@ -1181,7 +1181,7 @@ static void Ins_ListInstitutionsForEdition (void)
 	 fprintf (Gbl.F.Out,"<select name=\"OthCtyCod\" style=\"width:40px;\""
 			    " onchange=\"document.getElementById('%s').submit();\" />"
 			    "<option value=\"0\"",
-		  Gbl.FormId);
+		  Gbl.Form.Id);
 	 if (Ins->CtyCod == 0)
 	    fprintf (Gbl.F.Out," selected=\"selected\"");
 	 fprintf (Gbl.F.Out,">%s</option>",Txt_Another_country);
@@ -1213,7 +1213,7 @@ static void Ins_ListInstitutionsForEdition (void)
                             " class=\"INPUT_SHORT_NAME\""
 			    " onchange=\"document.getElementById('%s').submit();\" />",
 		  Ins_MAX_LENGTH_INSTITUTION_SHORT_NAME,Ins->ShortName,
-		  Gbl.FormId);
+		  Gbl.Form.Id);
 	 Act_FormEnd ();
 	}
       else
@@ -1231,7 +1231,7 @@ static void Ins_ListInstitutionsForEdition (void)
                             " class=\"INPUT_FULL_NAME\""
 			    " onchange=\"document.getElementById('%s').submit();\" />",
 		  Ins_MAX_LENGTH_INSTITUTION_FULL_NAME,Ins->FullName,
-		  Gbl.FormId);
+		  Gbl.Form.Id);
 	 Act_FormEnd ();
 	}
       else
@@ -1249,7 +1249,7 @@ static void Ins_ListInstitutionsForEdition (void)
                             " class=\"INPUT_WWW\""
 			    " onchange=\"document.getElementById('%s').submit();\" />",
 		  Cns_MAX_LENGTH_WWW,Ins->WWW,
-		  Gbl.FormId);
+		  Gbl.Form.Id);
 	 Act_FormEnd ();
 	 fprintf (Gbl.F.Out,"</td>");
 	}
@@ -1296,7 +1296,7 @@ static void Ins_ListInstitutionsForEdition (void)
 			    "<option value=\"%u\" selected=\"selected\">%s</option>"
 			    "<option value=\"%u\">%s</option>"
 			    "</select>",
-		  Gbl.FormId,
+		  Gbl.Form.Id,
 		  (unsigned) Ins_GetStatusBitsFromStatusTxt (Ins_STATUS_PENDING),
 		  Txt_INSTITUTION_STATUS[Ins_STATUS_PENDING],
 		  (unsigned) Ins_GetStatusBitsFromStatusTxt (Ins_STATUS_ACTIVE),
diff --git a/swad_layout.c b/swad_layout.c
index 7424b7c9a..c9054b549 100644
--- a/swad_layout.c
+++ b/swad_layout.c
@@ -1073,8 +1073,8 @@ void Lay_PutCalculateIconWithText (const char *Alt,const char *Text)
 		      "&nbsp;%s"
 		      "</div>"
 		      "</a>",
-	    Gbl.NumForm,Gbl.Prefs.IconsURL,Alt,Text,
-	    Gbl.NumForm,Gbl.Prefs.IconsURL,Alt,Text,
+	    Gbl.Form.Num,Gbl.Prefs.IconsURL,Alt,Text,
+	    Gbl.Form.Num,Gbl.Prefs.IconsURL,Alt,Text,
 	    Text);
   }
 
diff --git a/swad_link.c b/swad_link.c
index ac287f944..d013e6b55 100644
--- a/swad_link.c
+++ b/swad_link.c
@@ -356,7 +356,7 @@ static void Lnk_ListLinksForEdition (void)
                          " class=\"INPUT_SHORT_NAME\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
                Lnk_MAX_LENGTH_LINK_SHORT_NAME,Lnk->ShortName,
-               Gbl.FormId);
+               Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -369,7 +369,7 @@ static void Lnk_ListLinksForEdition (void)
                          " class=\"INPUT_FULL_NAME\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
                Lnk_MAX_LENGTH_LINK_FULL_NAME,Lnk->FullName,
-               Gbl.FormId);
+               Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -382,7 +382,7 @@ static void Lnk_ListLinksForEdition (void)
                          " class=\"INPUT_WWW\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
                Cns_MAX_LENGTH_WWW,Lnk->WWW,
-               Gbl.FormId);
+               Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>"
                          "</tr>");
diff --git a/swad_mail.c b/swad_mail.c
index 2f5bc6fc4..f04fd3bbd 100644
--- a/swad_mail.c
+++ b/swad_mail.c
@@ -424,7 +424,7 @@ static void Mai_ListMailDomainsForEdition (void)
 	                 " size=\"15\" maxlength=\"%u\" value=\"%s\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
                Mai_MAX_LENGTH_MAIL_DOMAIN,Mai->Domain,
-               Gbl.FormId);
+               Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -436,7 +436,7 @@ static void Mai_ListMailDomainsForEdition (void)
 	                 " size=\"40\" maxlength=\"%u\" value=\"%s\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
                Mai_MAX_LENGTH_MAIL_INFO,Mai->Info,
-               Gbl.FormId);
+               Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
diff --git a/swad_mark.c b/swad_mark.c
index ede13eb95..b6050515d 100644
--- a/swad_mark.c
+++ b/swad_mark.c
@@ -143,7 +143,7 @@ void Mrk_GetAndWriteNumRowsHeaderAndFooter (Brw_FileType_t FileType,
                Mrk_HeadOrFootStr[Brw_HEADER],Marks.Header,
                Gbl.FileBrowser.InputStyle,
                Gbl.RowEvenOdd,
-               Gbl.FormId);
+               Gbl.Form.Id);
       Brw_ParamListFiles (FileType,PathInTree,FileName);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
@@ -170,7 +170,7 @@ void Mrk_GetAndWriteNumRowsHeaderAndFooter (Brw_FileType_t FileType,
                Mrk_HeadOrFootStr[Brw_FOOTER],Marks.Footer,
                Gbl.FileBrowser.InputStyle,
                Gbl.RowEvenOdd,
-               Gbl.FormId);
+               Gbl.Form.Id);
       Brw_ParamListFiles (FileType,PathInTree,FileName);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
diff --git a/swad_message.c b/swad_message.c
index 91425e189..e619488cc 100644
--- a/swad_message.c
+++ b/swad_message.c
@@ -469,7 +469,7 @@ static void Msg_ShowOneUniqueRecipient (void)
    ShowPhoto = Pho_ShowUsrPhotoIsAllowed (&Gbl.Usrs.Other.UsrDat,PhotoURL);
    Pho_ShowUsrPhoto (&Gbl.Usrs.Other.UsrDat,ShowPhoto ? PhotoURL :
 					                NULL,
-		     "PHOTO21x28",Pho_ZOOM,NULL);
+		     "PHOTO21x28",Pho_ZOOM,false);
 
    /****** Write user's IDs ******/
    fprintf (Gbl.F.Out,"<div class=\"MSG_TO_ONE_RCP %s\">",
@@ -2973,7 +2973,7 @@ void Msg_WriteMsgAuthor (struct UsrData *UsrDat,
       ShowPhoto = Pho_ShowUsrPhotoIsAllowed (UsrDat,PhotoURL);
       Pho_ShowUsrPhoto (UsrDat,ShowPhoto ? PhotoURL :
                                            NULL,
-                        "PHOTO30x40",Pho_ZOOM,NULL);
+                        "PHOTO30x40",Pho_ZOOM,false);
       fprintf (Gbl.F.Out,"</td>");
 
       /***** Second column with user name (if author has a web page, put a link to it) *****/
@@ -3136,7 +3136,7 @@ static void Msg_WriteMsgFrom (struct UsrData *UsrDat,bool Deleted)
    ShowPhoto = (Pho_ShowUsrPhotoIsAllowed (UsrDat,PhotoURL));
    Pho_ShowUsrPhoto (UsrDat,ShowPhoto ? PhotoURL :
                 	                NULL,
-                     "PHOTO21x28",Pho_ZOOM,NULL);
+                     "PHOTO21x28",Pho_ZOOM,false);
 
    /***** Write user's name *****/
    fprintf (Gbl.F.Out,"</td>"
@@ -3282,7 +3282,7 @@ static void Msg_WriteMsgTo (Msg_TypeOfMessages_t TypeOfMessages,long MsgCod)
                                  false);
          Pho_ShowUsrPhoto (&UsrDat,ShowPhoto ? PhotoURL :
                         	               NULL,
-                           "PHOTO21x28",Pho_ZOOM,NULL);
+                           "PHOTO21x28",Pho_ZOOM,false);
 
          /* Write user's name */
          fprintf (Gbl.F.Out,"</td>"
@@ -3655,7 +3655,7 @@ void Msg_ListBannedUsrs (void)
             ShowPhoto = Pho_ShowUsrPhotoIsAllowed (&UsrDat,PhotoURL);
             Pho_ShowUsrPhoto (&UsrDat,ShowPhoto ? PhotoURL :
                         	                  NULL,
-                              "PHOTO21x28",Pho_ZOOM,NULL);
+                              "PHOTO21x28",Pho_ZOOM,false);
             fprintf (Gbl.F.Out,"</td>");
 
             /* Write user's full name */
diff --git a/swad_network.c b/swad_network.c
index 711a71852..3ad3987dd 100644
--- a/swad_network.c
+++ b/swad_network.c
@@ -335,7 +335,7 @@ void Net_ShowFormMyWebsAndSocialNets (void)
 			 " style=\"width:500px;\" maxlength=\"%u\" value=\"%s\""
 			 " onchange=\"document.getElementById('%s').submit();\" />",
 	       Cns_MAX_LENGTH_URL,URL,
-	       Gbl.FormId);
+	       Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>"
 			 "</tr>");
diff --git a/swad_notification.c b/swad_notification.c
index 6945a90e9..cc051517b 100644
--- a/swad_notification.c
+++ b/swad_notification.c
@@ -616,7 +616,7 @@ static void Ntf_WriteFormAllNotifications (bool AllNotifications)
       fprintf (Gbl.F.Out," checked=\"checked\"");
    fprintf (Gbl.F.Out," onclick=\"document.getElementById('%s').submit();\" />"
                       " %s",
-            Gbl.FormId,
+            Gbl.Form.Id,
             Txt_Show_all_notifications);
    Act_FormEnd ();
    fprintf (Gbl.F.Out,"</div>");
@@ -637,7 +637,7 @@ static bool Ntf_GetAllNotificationsFromForm (void)
 /*****************************************************************************/
 /*********** Put form to go to an action depending on the event **************/
 /*****************************************************************************/
-// Return the value of Gbl.InsideForm (true if form is started)
+// Return the value of Gbl.Form.Inside (true if form is started)
 
 static bool Ntf_StartFormGoToAction (Ntf_NotifyEvent_t NotifyEvent,
                                      long CrsCod,long Cod)
@@ -712,7 +712,7 @@ static bool Ntf_StartFormGoToAction (Ntf_NotifyEvent_t NotifyEvent,
      }
 
    /***** Parameter to go to another course/degree/centre/institution *****/
-   if (Gbl.InsideForm)
+   if (Gbl.Form.Inside)
      {
       if (CrsCod > 0)				// Course specified
 	{
@@ -736,7 +736,7 @@ static bool Ntf_StartFormGoToAction (Ntf_NotifyEvent_t NotifyEvent,
 	}
      }
 
-   return Gbl.InsideForm;
+   return Gbl.Form.Inside;
   }
 
 /*****************************************************************************/
diff --git a/swad_photo.c b/swad_photo.c
index a28ae926a..9f4e9747d 100644
--- a/swad_photo.c
+++ b/swad_photo.c
@@ -312,7 +312,8 @@ void Pho_ReqPhoto (const struct UsrData *UsrDat,bool PhotoExists,const char *Pho
    fprintf (Gbl.F.Out,"<tr>"
                       "<td colspan=\"2\">");
    // if (PhotoExists)
-   Pho_ShowUsrPhoto (UsrDat,PhotoURL,"PHOTO186x248",Pho_NO_ZOOM,NULL);
+   Pho_ShowUsrPhoto (UsrDat,PhotoURL,
+                     "PHOTO186x248",Pho_NO_ZOOM,false);
    Lay_ShowAlert (Lay_INFO,Txt_You_can_send_a_file_with_an_image_in_jpg_format_);
    fprintf (Gbl.F.Out,"</td>"
                       "</tr>");
@@ -550,7 +551,7 @@ void Pho_ReceivePhotoAndDetectFaces (bool ItsMe,const struct UsrData *UsrDat)
             Lay_ShowErrorAndExit ("Can not read text file with coordinates of detected faces.");
 
          /***** Read file with coordinates for image map and compute the number of faces *****/
-         NumLastForm = Gbl.NumForm;
+         NumLastForm = Gbl.Form.Num;
          while (!feof (FileTxtMap))
            {
             if (fscanf (FileTxtMap,"%u %u %u %u %s\n",&X,&Y,&Radius,&BackgroundCode,StrFileName) != 5)        // Example of StrFileName = "4924a838630e_016"
@@ -1028,13 +1029,13 @@ void Pho_UpdatePhotoName (struct UsrData *UsrDat)
 
 void Pho_ShowUsrPhoto (const struct UsrData *UsrDat,const char *PhotoURL,
                        const char *ClassPhoto,Pho_Zoom_t Zoom,
-                       const char *Id)
+                       bool FormUnique)
   {
    char SpecialFullName [3*(Usr_MAX_BYTES_NAME_SPEC_CHAR+1)+1];
    char SpecialShortName[3*(Usr_MAX_BYTES_NAME_SPEC_CHAR+1)+6];
    char SpecialSurnames [2*(Usr_MAX_BYTES_NAME_SPEC_CHAR+1)+1];
    bool PhotoExists;
-   bool PutLinkToPublicProfile = !Gbl.InsideForm &&						// Only if not inside another form
+   bool PutLinkToPublicProfile = !Gbl.Form.Inside &&						// Only if not inside another form
                                  Act_Actions[Gbl.CurrentAct].BrowserWindow == Act_MAIN_WINDOW;	// Only in main window
    bool PutZoomCode = PhotoURL &&							// Photo exists
                       Zoom == Pho_ZOOM &&						// Make zoom
@@ -1049,13 +1050,13 @@ void Pho_ShowUsrPhoto (const struct UsrData *UsrDat,const char *PhotoURL,
    /***** Start form to go to public profile *****/
    if (PutLinkToPublicProfile)
      {
-      if (Id)
-         Act_FormStartId (ActSeePubPrf,Id);
+      if (FormUnique)
+         Act_FormStartUnique (ActSeePubPrf);
       else
          Act_FormStart (ActSeePubPrf);
       Usr_PutParamUsrCodEncrypted (UsrDat->EncryptedUsrCod);
-      if (Id)
-         Act_LinkFormSubmitId (NULL,NULL,Id);
+      if (FormUnique)
+         Act_LinkFormSubmitUnique (NULL,NULL);
       else
          Act_LinkFormSubmit (NULL,NULL);
      }
@@ -1570,7 +1571,7 @@ static void Pho_PutSelectorForTypeOfAvg (void)
    Usr_PutParamColsClassPhoto ();
    fprintf (Gbl.F.Out,"<select name=\"AvgType\""
                       " onchange=\"document.getElementById('%s').submit();\">",
-            Gbl.FormId);
+            Gbl.Form.Id);
    for (TypeOfAvg = (Pho_AvgPhotoTypeOfAverage_t) 0;
 	TypeOfAvg < Pho_NUM_AVERAGE_PHOTO_TYPES;
 	TypeOfAvg++)
@@ -1639,7 +1640,7 @@ static void Pho_PutSelectorForHowComputePhotoSize (void)
    Usr_PutParamColsClassPhoto ();
    fprintf (Gbl.F.Out,"<select name=\"PhotoSize\""
                       " onchange=\"document.getElementById('%s').submit();\">",
-            Gbl.FormId);
+            Gbl.Form.Id);
    for (PhoSi = (Pho_HowComputePhotoSize_t) 0;
 	PhoSi < Pho_NUM_HOW_COMPUTE_PHOTO_SIZES;
 	PhoSi++)
@@ -1708,7 +1709,7 @@ static void Pho_PutSelectorForHowOrderDegrees (void)
    Usr_PutParamColsClassPhoto ();
    fprintf (Gbl.F.Out,"<select name=\"OrdDeg\""
                       " onchange=\"document.getElementById('%s').submit();\">",
-            Gbl.FormId);
+            Gbl.Form.Id);
    for (Order = (Pho_HowOrderDegrees_t) 0;
 	Order < Pho_NUM_HOW_ORDER_DEGREES;
 	Order++)
diff --git a/swad_photo.h b/swad_photo.h
index e0c548640..925413c9d 100644
--- a/swad_photo.h
+++ b/swad_photo.h
@@ -108,7 +108,7 @@ bool Pho_RemovePhoto (struct UsrData *UsrDat);
 void Pho_UpdatePhotoName (struct UsrData *UsrDat);
 void Pho_ShowUsrPhoto (const struct UsrData *UsrDat,const char *PhotoURL,
                        const char *ClassPhoto,Pho_Zoom_t Zoom,
-                       const char *Id);
+                       bool FormUnique);
 
 void Pho_ChangePhotoVisibility (void);
 
diff --git a/swad_place.c b/swad_place.c
index 4e325f269..d15c1ba5b 100644
--- a/swad_place.c
+++ b/swad_place.c
@@ -464,7 +464,7 @@ static void Plc_ListPlacesForEdition (void)
 	                 " maxlength=\"%u\" value=\"%s\""
                          " class=\"INPUT_SHORT_NAME\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
-               Plc_MAX_LENGTH_PLACE_SHORT_NAME,Plc->ShortName,Gbl.FormId);
+               Plc_MAX_LENGTH_PLACE_SHORT_NAME,Plc->ShortName,Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -476,7 +476,7 @@ static void Plc_ListPlacesForEdition (void)
 	                 " maxlength=\"%u\" value=\"%s\""
                          " class=\"INPUT_FULL_NAME\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
-               Plc_MAX_LENGTH_PLACE_FULL_NAME,Plc->FullName,Gbl.FormId);
+               Plc_MAX_LENGTH_PLACE_FULL_NAME,Plc->FullName,Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
diff --git a/swad_plugin.c b/swad_plugin.c
index be83bbdd5..90b972e38 100644
--- a/swad_plugin.c
+++ b/swad_plugin.c
@@ -401,7 +401,7 @@ static void Plg_ListPluginsForEdition (void)
       fprintf (Gbl.F.Out,"<input type=\"text\" name=\"Name\""
 	                 " size=\"10\" maxlength=\"%u\" value=\"%s\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
-               Plg_MAX_LENGTH_PLUGIN_NAME,Plg->Name,Gbl.FormId);
+               Plg_MAX_LENGTH_PLUGIN_NAME,Plg->Name,Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -412,7 +412,7 @@ static void Plg_ListPluginsForEdition (void)
       fprintf (Gbl.F.Out,"<input type=\"text\" name=\"Description\""
 	                 " size=\"30\" maxlength=\"%u\" value=\"%s\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
-               Plg_MAX_LENGTH_PLUGIN_DESCRIPTION,Plg->Description,Gbl.FormId);
+               Plg_MAX_LENGTH_PLUGIN_DESCRIPTION,Plg->Description,Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -423,7 +423,7 @@ static void Plg_ListPluginsForEdition (void)
       fprintf (Gbl.F.Out,"<input type=\"text\" name=\"Logo\""
 	                 " size=\"4\" maxlength=\"%u\" value=\"%s\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
-               Plg_MAX_LENGTH_PLUGIN_LOGO,Plg->Logo,Gbl.FormId);
+               Plg_MAX_LENGTH_PLUGIN_LOGO,Plg->Logo,Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -434,7 +434,7 @@ static void Plg_ListPluginsForEdition (void)
       fprintf (Gbl.F.Out,"<input type=\"text\" name=\"AppKey\""
 	                 " size=\"16\" maxlength=\"%u\" value=\"%s\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
-               Plg_MAX_LENGTH_PLUGIN_APP_KEY,Plg->AppKey,Gbl.FormId);
+               Plg_MAX_LENGTH_PLUGIN_APP_KEY,Plg->AppKey,Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -445,7 +445,7 @@ static void Plg_ListPluginsForEdition (void)
       fprintf (Gbl.F.Out,"<input type=\"text\" name=\"URL\""
 	                 " size=\"15\" maxlength=\"%u\" value=\"%s\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
-               Cns_MAX_LENGTH_WWW,Plg->URL,Gbl.FormId);
+               Cns_MAX_LENGTH_WWW,Plg->URL,Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -456,7 +456,7 @@ static void Plg_ListPluginsForEdition (void)
       fprintf (Gbl.F.Out,"<input type=\"text\" name=\"IP\""
 	                 " size=\"10\" maxlength=\"%u\" value=\"%s\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
-               Cns_MAX_LENGTH_IP,Plg->IP,Gbl.FormId);
+               Cns_MAX_LENGTH_IP,Plg->IP,Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>"
                          "</tr>");
diff --git a/swad_preference.c b/swad_preference.c
index 25cceaae2..1a66931d0 100644
--- a/swad_preference.c
+++ b/swad_preference.c
@@ -244,7 +244,7 @@ void Pre_PutSelectorToSelectLanguage (void)
    fprintf (Gbl.F.Out,"<select name=\"Lan\""
 	              " style=\"width:112px; margin:0;\""
 	              " onchange=\"document.getElementById('%s').submit();\">",
-            Gbl.FormId);
+            Gbl.Form.Id);
    for (Lan = (Txt_Language_t) 1;
 	Lan <= Txt_NUM_LANGUAGES;
 	Lan++)
diff --git a/swad_privacy.c b/swad_privacy.c
index c426b8158..7341f6d14 100644
--- a/swad_privacy.c
+++ b/swad_privacy.c
@@ -161,7 +161,7 @@ static void Pri_PutFormVisibility (const char *TxtLabel,
 	    fprintf (Gbl.F.Out," disabled=\"disabled\"");
 	 else
 	    fprintf (Gbl.F.Out," onclick=\"document.getElementById('%s').submit();\"",
-		     Gbl.FormId);
+		     Gbl.Form.Id);
 	 fprintf (Gbl.F.Out," />"
 			    "%s"
 			    "</li>",
diff --git a/swad_profile.c b/swad_profile.c
index 364dbd35b..92d3124c1 100644
--- a/swad_profile.c
+++ b/swad_profile.c
@@ -1447,7 +1447,7 @@ void Prf_ShowUsrInRanking (const struct UsrData *UsrDat,unsigned Rank)
       ShowPhoto = Pho_ShowUsrPhotoIsAllowed (UsrDat,PhotoURL);
       Pho_ShowUsrPhoto (UsrDat,ShowPhoto ? PhotoURL :
 					   NULL,
-			"PHOTO30x40",Pho_ZOOM,NULL);
+			"PHOTO30x40",Pho_ZOOM,false);
      }
 
    fprintf (Gbl.F.Out,"</td>"
diff --git a/swad_record.c b/swad_record.c
index c07151270..9be5d3329 100644
--- a/swad_record.c
+++ b/swad_record.c
@@ -219,7 +219,7 @@ void Rec_ListFieldsRecordsForEdition (void)
                          " onchange=\"document.getElementById('%s').submit();\" />",
                Rec_MAX_LENGTH_NAME_FIELD,
                Gbl.CurrentCrs.Records.LstFields.Lst[NumField].Name,
-               Gbl.FormId);
+               Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -231,7 +231,7 @@ void Rec_ListFieldsRecordsForEdition (void)
 	                 " size=\"2\" maxlength=\"2\" value=\"%u\""
                          " onchange=\"document.getElementById('%s').submit();\" />",
                Gbl.CurrentCrs.Records.LstFields.Lst[NumField].NumLines,
-               Gbl.FormId);
+               Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>");
 
@@ -241,7 +241,7 @@ void Rec_ListFieldsRecordsForEdition (void)
       Par_PutHiddenParamLong ("FieldCod",Gbl.CurrentCrs.Records.LstFields.Lst[NumField].FieldCod);
       fprintf (Gbl.F.Out,"<select name=\"Visibility\""
                          " onchange=\"document.getElementById('%s').submit();\">",
-               Gbl.FormId);
+               Gbl.Form.Id);
       for (Vis = (Rec_VisibilityRecordFields_t) 0;
 	   Vis < (Rec_VisibilityRecordFields_t) Rec_NUM_TYPES_VISIBILITY;
 	   Vis++)
@@ -1382,7 +1382,7 @@ static void Rec_WriteFormShowOfficeHours (bool ShowOfficeHours,const char *ListU
                       " class=\"ICON20x20\" />"
                       "<span class=\"%s\">&nbsp;%s</span>"
                       "</div>",
-            Gbl.FormId,
+            Gbl.Form.Id,
             Gbl.Prefs.IconsURL,
             Txt_Show_office_hours,
             Txt_Show_office_hours,
@@ -2075,7 +2075,7 @@ void Rec_ShowSharedUsrRecord (Rec_RecordViewType_t TypeOfView,
          break;
      }
 
-   PutFormLinks = !Gbl.InsideForm &&						// Only if not inside another form
+   PutFormLinks = !Gbl.Form.Inside &&						// Only if not inside another form
                   Act_Actions[Gbl.CurrentAct].BrowserWindow == Act_MAIN_WINDOW;	// Only in main window
 
    /***** Start frame *****/
@@ -2136,7 +2136,7 @@ void Rec_ShowSharedUsrRecord (Rec_RecordViewType_t TypeOfView,
 	    Rec_C3_TOP);
    Pho_ShowUsrPhoto (UsrDat,ShowPhoto ? PhotoURL :
                 	                NULL,
-		     "PHOTO186x248",Pho_NO_ZOOM,NULL);
+		     "PHOTO186x248",Pho_NO_ZOOM,false);
    fprintf (Gbl.F.Out,"</td>"
 		      "</tr>");
 
@@ -3376,7 +3376,7 @@ void Rec_ShowFormMyInsCtrDpt (void)
    fprintf (Gbl.F.Out,"<select name=\"OthCtyCod\" style=\"width:500px;\""
 	              " onchange=\"document.getElementById('%s').submit();\">"
                       "<option value=\"-1\"",
-	    Gbl.FormId);
+	    Gbl.Form.Id);
    if (Gbl.Usrs.Me.UsrDat.InsCtyCod <= 0)
       fprintf (Gbl.F.Out," selected=\"selected\"");
    fprintf (Gbl.F.Out," disabled=\"disabled\"></option>");
@@ -3415,7 +3415,7 @@ void Rec_ShowFormMyInsCtrDpt (void)
    fprintf (Gbl.F.Out,"<select name=\"OthInsCod\" style=\"width:500px;\""
 	              " onchange=\"document.getElementById('%s').submit();\">"
                       "<option value=\"-1\"",
-	    Gbl.FormId);
+	    Gbl.Form.Id);
    if (Gbl.Usrs.Me.UsrDat.InsCod < 0)
       fprintf (Gbl.F.Out," selected=\"selected\"");
    fprintf (Gbl.F.Out," disabled=\"disabled\"></option>"
@@ -3461,7 +3461,7 @@ void Rec_ShowFormMyInsCtrDpt (void)
       fprintf (Gbl.F.Out,"<select name=\"OthCtrCod\" style=\"width:500px;\""
 			 " onchange=\"document.getElementById('%s').submit();\">"
 			 "<option value=\"-1\"",
-	       Gbl.FormId);
+	       Gbl.Form.Id);
       if (Gbl.Usrs.Me.UsrDat.Tch.CtrCod < 0)
 	 fprintf (Gbl.F.Out," selected=\"selected\"");
       fprintf (Gbl.F.Out," disabled=\"disabled\"></option>"
@@ -3505,7 +3505,7 @@ void Rec_ShowFormMyInsCtrDpt (void)
       fprintf (Gbl.F.Out,"<select name=\"DptCod\" style=\"width:500px;\""
 			 " onchange=\"document.getElementById('%s').submit();\">"
 			 "<option value=\"-1\"",
-	       Gbl.FormId);
+	       Gbl.Form.Id);
       if (Gbl.Usrs.Me.UsrDat.Tch.DptCod < 0)
 	 fprintf (Gbl.F.Out," selected=\"selected\"");
       fprintf (Gbl.F.Out," disabled=\"disabled\"></option>"
@@ -3545,7 +3545,7 @@ void Rec_ShowFormMyInsCtrDpt (void)
 			 " onchange=\"document.getElementById('%s').submit();\" />",
                Cns_MAX_LENGTH_STRING,
 	       Gbl.Usrs.Me.UsrDat.Tch.Office,
-	       Gbl.FormId);
+	       Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>"
 	                 "</tr>");
@@ -3565,7 +3565,7 @@ void Rec_ShowFormMyInsCtrDpt (void)
 			 " onchange=\"document.getElementById('%s').submit();\" />",
 	       Usr_MAX_LENGTH_PHONE,
 	       Gbl.Usrs.Me.UsrDat.Tch.OfficePhone,
-	       Gbl.FormId);
+	       Gbl.Form.Id);
       Act_FormEnd ();
       fprintf (Gbl.F.Out,"</td>"
 	                 "</tr>");
diff --git a/swad_role.c b/swad_role.c
index 68dae7033..acb380c92 100644
--- a/swad_role.c
+++ b/swad_role.c
@@ -293,7 +293,7 @@ void Rol_PutFormToChangeMyRole (bool FormInHead)
    if (FormInHead)
       fprintf (Gbl.F.Out," style=\"width:130px;\"");
    fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\">",
-            Gbl.FormId);
+            Gbl.Form.Id);
    for (Role = Rol__GUEST_;
         Role < Rol_NUM_ROLES;
         Role++)
diff --git a/swad_scope.c b/swad_scope.c
index f3c00c7cc..fa72fc5e9 100644
--- a/swad_scope.c
+++ b/swad_scope.c
@@ -87,7 +87,7 @@ void Sco_PutSelectorScope (bool SendOnChange)
    fprintf (Gbl.F.Out,"<select name=\"Scope\"");
    if (SendOnChange)
       fprintf (Gbl.F.Out," onchange=\"document.getElementById('%s').submit();\"",
-               Gbl.FormId);
+               Gbl.Form.Id);
    fprintf (Gbl.F.Out,">");
 
    for (Scope = (Sco_Scope_t) 0;
diff --git a/swad_social.c b/swad_social.c
index 86bfe8881..ba31cbc51 100644
--- a/swad_social.c
+++ b/swad_social.c
@@ -63,7 +63,7 @@
 // Number of old publishings got and shown when I want to see old publishings
 #define Soc_MAX_OLD_PUBS_TO_GET_AND_SHOW  10	// If you change this number, set also this constant to the new value in JavaScript
 
-#define Soc_MAX_LENGTH_ID	(256+Cry_LENGTH_ENCRYPTED_STR_SHA256_BASE64+10+1)
+#define Soc_MAX_LENGTH_ID	(32+Cry_LENGTH_ENCRYPTED_STR_SHA256_BASE64+10+1)
 
 typedef enum
   {
@@ -882,7 +882,6 @@ static void Soc_WriteSocialNote (const struct SocialNote *SocNot,
    char SummaryStr[Cns_MAX_BYTES_TEXT+1];
    unsigned NumComments;
    char IdNewComment[Soc_MAX_LENGTH_ID];
-   char IdForm[Soc_MAX_LENGTH_ID];
 
    /***** Start frame ****/
    if (ShowNoteAlone)
@@ -929,11 +928,10 @@ static void Soc_WriteSocialNote (const struct SocialNote *SocNot,
 
       /***** Left: write author's photo *****/
       fprintf (Gbl.F.Out,"<div class=\"SOCIAL_LEFT_PHOTO\">");
-      Soc_SetUniqueId (IdForm);
       ShowPhoto = Pho_ShowUsrPhotoIsAllowed (&UsrDat,PhotoURL);
       Pho_ShowUsrPhoto (&UsrDat,ShowPhoto ? PhotoURL :
 					    NULL,
-			"PHOTO45x60",Pho_ZOOM,IdForm);
+			"PHOTO45x60",Pho_ZOOM,true);	// Use unique id
       fprintf (Gbl.F.Out,"</div>");
 
       /***** Right: author's name, time, summary and buttons *****/
@@ -1121,7 +1119,6 @@ static void Soc_WriteTopPublisher (const struct SocialPublishing *SocPub)
    extern const char *Txt_SOCIAL_USER_has_shared;
    extern const char *Txt_SOCIAL_USER_has_commented;
    struct UsrData UsrDat;
-   char IdForm[Soc_MAX_LENGTH_ID];
 
    if (SocPub)
       if (SocPub->PubType == Soc_PUB_SHARED_NOTE ||
@@ -1137,10 +1134,9 @@ static void Soc_WriteTopPublisher (const struct SocialPublishing *SocPub)
 	    fprintf (Gbl.F.Out,"<div class=\"SOCIAL_TOP_CONTAINER SOCIAL_TOP_PUBLISHER\">");
 
 	    /***** Show user's name inside form to go to user's public profile *****/
-	    Soc_SetUniqueId (IdForm);
-	    Act_FormStartId (ActSeePubPrf,IdForm);
+	    Act_FormStartUnique (ActSeePubPrf);
 	    Usr_PutParamUsrCodEncrypted (UsrDat.EncryptedUsrCod);
-	    Act_LinkFormSubmitId (Txt_View_public_profile,"SOCIAL_TOP_PUBLISHER",IdForm);
+	    Act_LinkFormSubmitUnique (Txt_View_public_profile,"SOCIAL_TOP_PUBLISHER");
 	    Str_LimitLengthHTMLStr (UsrDat.FullName,40);
 	    fprintf (Gbl.F.Out,"%s</a>",UsrDat.FullName);
 	    Act_FormEnd ();
@@ -1166,24 +1162,21 @@ static void Soc_WriteTopPublisher (const struct SocialPublishing *SocPub)
 static void Soc_WriteAuthorNote (struct UsrData *UsrDat)
   {
    extern const char *Txt_View_public_profile;
-   char IdForm[Soc_MAX_LENGTH_ID];
 
    fprintf (Gbl.F.Out,"<div class=\"SOCIAL_RIGHT_AUTHOR\">");
 
    /***** Show user's name inside form to go to user's public profile *****/
-   Soc_SetUniqueId (IdForm);
-   Act_FormStartId (ActSeePubPrf,IdForm);
+   Act_FormStartUnique (ActSeePubPrf);
    Usr_PutParamUsrCodEncrypted (UsrDat->EncryptedUsrCod);
-   Act_LinkFormSubmitId (Txt_View_public_profile,"DAT_N_BOLD",IdForm);
+   Act_LinkFormSubmitUnique (Txt_View_public_profile,"DAT_N_BOLD");
    Str_LimitLengthHTMLStr (UsrDat->FullName,16);
    fprintf (Gbl.F.Out,"%s</a>",UsrDat->FullName);
    Act_FormEnd ();
 
    /***** Show user's nickname inside form to go to user's public profile *****/
-   Soc_SetUniqueId (IdForm);
-   Act_FormStartId (ActSeePubPrf,IdForm);
+   Act_FormStartUnique (ActSeePubPrf);
    Usr_PutParamUsrCodEncrypted (UsrDat->EncryptedUsrCod);
-   Act_LinkFormSubmitId (Txt_View_public_profile,"DAT_LIGHT",IdForm);
+   Act_LinkFormSubmitUnique (Txt_View_public_profile,"DAT_LIGHT");
    fprintf (Gbl.F.Out," @%s</a>",UsrDat->Nickname);
    Act_FormEnd ();
 
@@ -1266,10 +1259,9 @@ static void Soc_PutFormGoToAction (const struct SocialNote *SocNot)
    extern const char *Txt_SOCIAL_NOTE[Soc_NUM_NOTE_TYPES];
    extern const char *Txt_not_available;
    char Class[64];
-   char IdForm[Soc_MAX_LENGTH_ID];
 
    if (SocNot->Unavailable ||	// File/notice... pointer by this social note is unavailable
-       Gbl.InsideForm)		// Inside another form
+       Gbl.Form.Inside)		// Inside another form
      {
       /***** Do not put form *****/
       fprintf (Gbl.F.Out,"<span class=\"DAT_LIGHT\">%s",
@@ -1280,41 +1272,39 @@ static void Soc_PutFormGoToAction (const struct SocialNote *SocNot)
      }
    else			// Not inside another form
      {
-      Soc_SetUniqueId (IdForm);
-
       /***** Parameters depending on the type of note *****/
       switch (SocNot->NoteType)
 	{
 	 case Soc_NOTE_INS_DOC_PUB_FILE:
 	 case Soc_NOTE_INS_SHA_PUB_FILE:
-	    Act_FormStartId (Soc_DefaultActions[SocNot->NoteType],IdForm);
+	    Act_FormStartUnique (Soc_DefaultActions[SocNot->NoteType]);
 	    Brw_PutHiddenParamFilCod (SocNot->Cod);
 	    if (SocNot->HieCod != Gbl.CurrentIns.Ins.InsCod)	// Not the current institution
 	       Ins_PutParamInsCod (SocNot->HieCod);		// Go to another institution
 	    break;
 	 case Soc_NOTE_CTR_DOC_PUB_FILE:
 	 case Soc_NOTE_CTR_SHA_PUB_FILE:
-	    Act_FormStartId (Soc_DefaultActions[SocNot->NoteType],IdForm);
+	    Act_FormStartUnique (Soc_DefaultActions[SocNot->NoteType]);
 	    Brw_PutHiddenParamFilCod (SocNot->Cod);
 	    if (SocNot->HieCod != Gbl.CurrentCtr.Ctr.CtrCod)	// Not the current centre
 	       Ctr_PutParamCtrCod (SocNot->HieCod);		// Go to another centre
 	    break;
 	 case Soc_NOTE_DEG_DOC_PUB_FILE:
 	 case Soc_NOTE_DEG_SHA_PUB_FILE:
-	    Act_FormStartId (Soc_DefaultActions[SocNot->NoteType],IdForm);
+	    Act_FormStartUnique (Soc_DefaultActions[SocNot->NoteType]);
 	    Brw_PutHiddenParamFilCod (SocNot->Cod);
 	    if (SocNot->HieCod != Gbl.CurrentDeg.Deg.DegCod)	// Not the current degree
 	       Deg_PutParamDegCod (SocNot->HieCod);		// Go to another degree
 	    break;
 	 case Soc_NOTE_CRS_DOC_PUB_FILE:
 	 case Soc_NOTE_CRS_SHA_PUB_FILE:
-	    Act_FormStartId (Soc_DefaultActions[SocNot->NoteType],IdForm);
+	    Act_FormStartUnique (Soc_DefaultActions[SocNot->NoteType]);
 	    Brw_PutHiddenParamFilCod (SocNot->Cod);
 	    if (SocNot->HieCod != Gbl.CurrentCrs.Crs.CrsCod)	// Not the current course
 	       Crs_PutParamCrsCod (SocNot->HieCod);		// Go to another course
 	    break;
 	 case Soc_NOTE_EXAM_ANNOUNCEMENT:
-	    Act_FormStartId (Soc_DefaultActions[SocNot->NoteType],IdForm);
+	    Act_FormStartUnique (Soc_DefaultActions[SocNot->NoteType]);
 	    Not_PutHiddenParamNotCod (SocNot->Cod);
 	    if (SocNot->HieCod != Gbl.CurrentCrs.Crs.CrsCod)	// Not the current course
 	       Crs_PutParamCrsCod (SocNot->HieCod);		// Go to another course
@@ -1322,13 +1312,13 @@ static void Soc_PutFormGoToAction (const struct SocialNote *SocNot)
 	 case Soc_NOTE_SOCIAL_POST:	// Not applicable
 	    return;
 	 case Soc_NOTE_FORUM_POST:
-	    Act_FormStartId (For_ActionsSeeFor[Gbl.Forum.ForumType],IdForm);
+	    Act_FormStartUnique (For_ActionsSeeFor[Gbl.Forum.ForumType]);
 	    For_PutAllHiddenParamsForum ();
 	    if (SocNot->HieCod != Gbl.CurrentCrs.Crs.CrsCod)	// Not the current course
 	       Crs_PutParamCrsCod (SocNot->HieCod);		// Go to another course
 	    break;
 	 case Soc_NOTE_NOTICE:
-	    Act_FormStartId (Soc_DefaultActions[SocNot->NoteType],IdForm);
+	    Act_FormStartUnique (Soc_DefaultActions[SocNot->NoteType]);
 	    Not_PutHiddenParamNotCod (SocNot->Cod);
 	    if (SocNot->HieCod != Gbl.CurrentCrs.Crs.CrsCod)	// Not the current course
 	       Crs_PutParamCrsCod (SocNot->HieCod);		// Go to another course
@@ -1339,8 +1329,7 @@ static void Soc_PutFormGoToAction (const struct SocialNote *SocNot)
 
       /***** Link and end form *****/
       sprintf (Class,"%s ICON_HIGHLIGHT",The_ClassFormBold[Gbl.Prefs.Theme]);
-      Act_LinkFormSubmitId (Txt_SOCIAL_NOTE[SocNot->NoteType],
-			    Class,IdForm);
+      Act_LinkFormSubmitUnique (Txt_SOCIAL_NOTE[SocNot->NoteType],Class);
       fprintf (Gbl.F.Out,"<img src=\"%s/%s\""
 	                 " alt=\"%s\" title=\"%s\""
 	                 " class=\"ICON20x20\" />"
@@ -1636,7 +1625,7 @@ static void Soc_PutHiddenFormToWriteNewPost (void)
    ShowPhoto = Pho_ShowUsrPhotoIsAllowed (&Gbl.Usrs.Me.UsrDat,PhotoURL);
    Pho_ShowUsrPhoto (&Gbl.Usrs.Me.UsrDat,ShowPhoto ? PhotoURL :
 						     NULL,
-		     "PHOTO45x60",Pho_ZOOM,NULL);
+		     "PHOTO45x60",Pho_ZOOM,false);
    fprintf (Gbl.F.Out,"</div>");
 
    /***** Right: author's name, time, summary and buttons *****/
@@ -1784,7 +1773,6 @@ static void Soc_PutHiddenFormToWriteNewCommentToSocialNote (long NotCod,
                                                             const char UniqueId[Soc_MAX_LENGTH_ID])
   {
    extern const char *Txt_Send_comment;
-   char IdForm[Soc_MAX_LENGTH_ID];
 
    /***** Start container *****/
    fprintf (Gbl.F.Out,"<div id=\"%s\""
@@ -1793,14 +1781,13 @@ static void Soc_PutHiddenFormToWriteNewCommentToSocialNote (long NotCod,
 	    UniqueId);
 
    /***** Start form to write the post *****/
-   Soc_SetUniqueId (IdForm);
    if (Gbl.Usrs.Other.UsrDat.UsrCod > 0)
      {
-      Act_FormStartIdAnchor (ActRcvSocComUsr,IdForm,"timeline");
+      Act_FormStartUniqueAnchor (ActRcvSocComUsr,"timeline");
       Usr_PutParamOtherUsrCodEncrypted ();
      }
    else
-      Act_FormStartId (ActRcvSocComGbl,IdForm);
+      Act_FormStartUnique (ActRcvSocComGbl);
    Soc_PutHiddenParamNotCod (NotCod);
    fprintf (Gbl.F.Out,"<textarea name=\"Comment\" cols=\"45\" rows=\"3\">"
 		      "</textarea>");
@@ -1910,7 +1897,6 @@ static void Soc_WriteSocialComment (struct SocialComment *SocCom,
    bool IAmTheAuthor;
    bool ShowPhoto = false;
    char PhotoURL[PATH_MAX+1];
-   char IdForm[Soc_MAX_LENGTH_ID];
 
    if (ShowCommentAlone)
      {
@@ -1942,11 +1928,10 @@ static void Soc_WriteSocialComment (struct SocialComment *SocCom,
 
       /***** Left: write author's photo *****/
       fprintf (Gbl.F.Out,"<div class=\"SOCIAL_COMMENT_PHOTO\">");
-      Soc_SetUniqueId (IdForm);
       ShowPhoto = Pho_ShowUsrPhotoIsAllowed (&UsrDat,PhotoURL);
       Pho_ShowUsrPhoto (&UsrDat,ShowPhoto ? PhotoURL :
 					    NULL,
-			"PHOTO30x40",Pho_ZOOM,IdForm);
+			"PHOTO30x40",Pho_ZOOM,true);	// Use unique id
       fprintf (Gbl.F.Out,"</div>");
 
       /***** Right: author's name, time, summary and buttons *****/
@@ -1990,24 +1975,21 @@ static void Soc_WriteSocialComment (struct SocialComment *SocCom,
 static void Soc_WriteAuthorComment (struct UsrData *UsrDat)
   {
    extern const char *Txt_View_public_profile;
-   char IdForm[Soc_MAX_LENGTH_ID];
 
    fprintf (Gbl.F.Out,"<div class=\"SOCIAL_COMMENT_RIGHT_AUTHOR\">");
 
    /***** Show user's name inside form to go to user's public profile *****/
-   Soc_SetUniqueId (IdForm);
-   Act_FormStartId (ActSeePubPrf,IdForm);
+   Act_FormStartUnique (ActSeePubPrf);
    Usr_PutParamUsrCodEncrypted (UsrDat->EncryptedUsrCod);
-   Act_LinkFormSubmitId (Txt_View_public_profile,"DAT_BOLD",IdForm);
+   Act_LinkFormSubmitUnique (Txt_View_public_profile,"DAT_BOLD");
    Str_LimitLengthHTMLStr (UsrDat->FullName,12);
    fprintf (Gbl.F.Out,"%s</a>",UsrDat->FullName);
    Act_FormEnd ();
 
    /***** Show user's nickname inside form to go to user's public profile *****/
-   Soc_SetUniqueId (IdForm);
-   Act_FormStartId (ActSeePubPrf,IdForm);
+   Act_FormStartUnique (ActSeePubPrf);
    Usr_PutParamUsrCodEncrypted (UsrDat->EncryptedUsrCod);
-   Act_LinkFormSubmitId (Txt_View_public_profile,"DAT_LIGHT",IdForm);
+   Act_LinkFormSubmitUnique (Txt_View_public_profile,"DAT_LIGHT");
    fprintf (Gbl.F.Out," @%s</a>",UsrDat->Nickname);
    Act_FormEnd ();
 
@@ -2022,17 +2004,15 @@ static void Soc_WriteAuthorComment (struct UsrData *UsrDat)
 static void Soc_PutFormToRemoveComment (long ComCod)
   {
    extern const char *Txt_Remove;
-   char IdForm[Soc_MAX_LENGTH_ID];
 
    /***** Form to remove social publishing *****/
-   Soc_SetUniqueId (IdForm);
    if (Gbl.Usrs.Other.UsrDat.UsrCod > 0)
      {
-      Act_FormStartIdAnchor (ActReqRemSocComUsr,IdForm,"timeline");
+      Act_FormStartUniqueAnchor (ActReqRemSocComUsr,"timeline");
       Usr_PutParamOtherUsrCodEncrypted ();
      }
    else
-      Act_FormStartId (ActReqRemSocComGbl,IdForm);
+      Act_FormStartUnique (ActReqRemSocComGbl);
    Soc_PutHiddenParamComCod (ComCod);
    fprintf (Gbl.F.Out,"<div class=\"SOCIAL_ICON_REMOVE ICON_HIGHLIGHT\">"
 		      "<input type=\"image\""
@@ -2078,17 +2058,15 @@ static void Soc_PutDisabledIconShare (unsigned NumShared)
 static void Soc_PutFormToShareSocialNote (long NotCod)
   {
    extern const char *Txt_Share;
-   char IdForm[Soc_MAX_LENGTH_ID];
 
    /***** Form to share social note *****/
-   Soc_SetUniqueId (IdForm);
    if (Gbl.Usrs.Other.UsrDat.UsrCod > 0)
      {
-      Act_FormStartIdAnchor (ActShaSocNotUsr,IdForm,"timeline");
+      Act_FormStartUniqueAnchor (ActShaSocNotUsr,"timeline");
       Usr_PutParamOtherUsrCodEncrypted ();
      }
    else
-      Act_FormStartId (ActShaSocNotGbl,IdForm);
+      Act_FormStartUnique (ActShaSocNotGbl);
    Soc_PutHiddenParamNotCod (NotCod);
    fprintf (Gbl.F.Out,"<div class=\"SOCIAL_ICON_SHARE ICON_HIGHLIGHT\">"
 		      "<input type=\"image\""
@@ -2110,17 +2088,15 @@ static void Soc_PutFormToShareSocialNote (long NotCod)
 static void Soc_PutFormToUnshareSocialPublishing (long NotCod)
   {
    extern const char *Txt_Unshare;
-   char IdForm[Soc_MAX_LENGTH_ID];
 
    /***** Form to share social publishing *****/
-   Soc_SetUniqueId (IdForm);
    if (Gbl.Usrs.Other.UsrDat.UsrCod > 0)
      {
-      Act_FormStartIdAnchor (ActUnsSocPubUsr,IdForm,"timeline");
+      Act_FormStartUniqueAnchor (ActUnsSocPubUsr,"timeline");
       Usr_PutParamOtherUsrCodEncrypted ();
      }
    else
-      Act_FormStartId (ActUnsSocPubGbl,IdForm);
+      Act_FormStartUnique (ActUnsSocPubGbl);
    Soc_PutHiddenParamNotCod (NotCod);
    fprintf (Gbl.F.Out,"<div class=\"SOCIAL_ICON_SHARE ICON_HIGHLIGHT\">"
 		      "<input type=\"image\""
@@ -2141,16 +2117,15 @@ static void Soc_PutFormToUnshareSocialPublishing (long NotCod)
 static void Soc_PutFormToRemoveSocialPublishing (long NotCod)
   {
    extern const char *Txt_Remove;
-   char IdForm[Soc_MAX_LENGTH_ID];
 
    /***** Form to remove social publishing *****/
    if (Gbl.Usrs.Other.UsrDat.UsrCod > 0)
      {
-      Act_FormStartIdAnchor (ActReqRemSocPubUsr,IdForm,"timeline");
+      Act_FormStartUniqueAnchor (ActReqRemSocPubUsr,"timeline");
       Usr_PutParamOtherUsrCodEncrypted ();
      }
    else
-      Act_FormStartId (ActReqRemSocPubGbl,IdForm);
+      Act_FormStartUnique (ActReqRemSocPubGbl);
    Soc_PutHiddenParamNotCod (NotCod);
    fprintf (Gbl.F.Out,"<div class=\"SOCIAL_ICON_REMOVE ICON_HIGHLIGHT\">"
 		      "<input type=\"image\""
@@ -2964,7 +2939,6 @@ static void Soc_ShowUsrsWhoHaveSharedSocialNote (const struct SocialNote *SocNot
    struct UsrData UsrDat;
    bool ShowPhoto;
    char PhotoURL[PATH_MAX+1];
-   char IdForm[Soc_MAX_LENGTH_ID];
 
    /* Show number of users who have shared this social note */
    fprintf (Gbl.F.Out,"<span class=\"SOCIAL_NUM_SHARES\"> %u</span>",
@@ -3004,11 +2978,10 @@ static void Soc_ShowUsrsWhoHaveSharedSocialNote (const struct SocialNote *SocNot
 	    if (Usr_ChkUsrCodAndGetAllUsrDataFromUsrCod (&UsrDat))
 	      {
                fprintf (Gbl.F.Out,"<div class=\"SOCIAL_SHARER\">");
-               Soc_SetUniqueId (IdForm);
 	       ShowPhoto = Pho_ShowUsrPhotoIsAllowed (&UsrDat,PhotoURL);
 	       Pho_ShowUsrPhoto (&UsrDat,ShowPhoto ? PhotoURL :
 	                                             NULL,
-	                         "PHOTO18x24",Pho_ZOOM,IdForm);
+	                         "PHOTO18x24",Pho_ZOOM,true);	// Use unique id
                fprintf (Gbl.F.Out,"</div>");
 
                NumUsrsShown++;
diff --git a/swad_statistic.c b/swad_statistic.c
index bc3b685ac..49d5cb089 100644
--- a/swad_statistic.c
+++ b/swad_statistic.c
@@ -1808,7 +1808,7 @@ static void Sta_ShowNumHitsPerUsr (unsigned long NumRows,
       ShowPhoto = Pho_ShowUsrPhotoIsAllowed (&UsrDat,PhotoURL);
       Pho_ShowUsrPhoto (&UsrDat,ShowPhoto ? PhotoURL :
                                             NULL,
-                        "PHOTO15x20",Pho_ZOOM,NULL);
+                        "PHOTO15x20",Pho_ZOOM,false);
       fprintf (Gbl.F.Out,"</td>");
 
       /* Write the user's ID if user is a student in current course */
@@ -2053,7 +2053,7 @@ static void Sta_ShowDistrAccessesPerDaysAndHour (unsigned long NumRows,MYSQL_RES
    fprintf (Gbl.F.Out,"%s: ",Txt_Color_of_the_graphic);
    fprintf (Gbl.F.Out,"<select name=\"ColorType\""
                       " onchange=\"document.getElementById('%s').submit();\">",
-            Gbl.FormId);
+            Gbl.Form.Id);
    for (ColorType = (Sta_ColorType_t) 0;
 	ColorType < Sta_NUM_COLOR_TYPES;
 	ColorType++)
diff --git a/swad_survey.c b/swad_survey.c
index 31aaf4177..87840d98d 100644
--- a/swad_survey.c
+++ b/swad_survey.c
@@ -569,7 +569,7 @@ static void Svy_WriteAuthor (struct Survey *Svy)
    /***** Show photo *****/
    Pho_ShowUsrPhoto (&UsrDat,ShowPhoto ? PhotoURL :
                 	                 NULL,
-                     "PHOTO15x20",Pho_ZOOM,NULL);
+                     "PHOTO15x20",Pho_ZOOM,false);
 
    /***** Write name *****/
    strcpy (FirstName,UsrDat.FirstName);
diff --git a/swad_syllabus.c b/swad_syllabus.c
index 4520083c8..3ad3658af 100644
--- a/swad_syllabus.c
+++ b/swad_syllabus.c
@@ -153,7 +153,7 @@ void Syl_PutFormWhichSyllabus (void)
       fprintf (Gbl.F.Out," onclick=\"document.getElementById('%s').submit();\" />"
 	                 "%s"
                          "</li>",
-               Gbl.FormId,Txt_SYLLABUS_WHICH_SYLLABUS[WhichSyllabus]);
+               Gbl.Form.Id,Txt_SYLLABUS_WHICH_SYLLABUS[WhichSyllabus]);
      }
    fprintf (Gbl.F.Out,"</ul>"
 	              "</div>");
@@ -918,7 +918,7 @@ static void Syl_PutFormItemSyllabus (Inf_InfoType_t InfoType,bool NewItem,unsign
                       " onchange=\"document.getElementById('%s').submit();\" />",
 	    Syl_MAX_LENGTH_TEXT_ITEM,Text,
 	    Txt_Enter_a_new_item_here,
-	    Gbl.FormId);
+	    Gbl.Form.Id);
    Act_FormEnd ();
    fprintf (Gbl.F.Out,"</td>");
   }
diff --git a/swad_test.c b/swad_test.c
index 08fa52797..d7f932115 100644
--- a/swad_test.c
+++ b/swad_test.c
@@ -1525,7 +1525,7 @@ static void Tst_ShowFormEditTags (void)
          fprintf (Gbl.F.Out,"<input type=\"text\" name=\"NewTagTxt\""
                             " size=\"36\" maxlength=\"%u\" value=\"%s\""
                             " onchange=\"document.getElementById('%s').submit();\" />",
-                  Tst_MAX_TAG_LENGTH,row[1],Gbl.FormId);
+                  Tst_MAX_TAG_LENGTH,row[1],Gbl.Form.Id);
          Act_FormEnd ();
          fprintf (Gbl.F.Out,"</td>"
                             "</tr>");
@@ -2588,7 +2588,7 @@ static void Tst_ListOneOrMoreQuestionsToEdit (unsigned long NumRows,MYSQL_RES *m
          if (Str_ConvertToUpperLetter (row[3][0]) == 'Y')
             fprintf (Gbl.F.Out," checked=\"checked\"");
          fprintf (Gbl.F.Out," onclick=\"document.getElementById('%s').submit();\" />",
-                  Gbl.FormId);
+                  Gbl.Form.Id);
          Act_FormEnd ();
         }
       fprintf (Gbl.F.Out,"</td>");
@@ -6461,7 +6461,7 @@ static void Tst_ShowDataUsr (struct UsrData *UsrDat,unsigned NumExams)
    ShowPhoto = Pho_ShowUsrPhotoIsAllowed (UsrDat,PhotoURL);
    Pho_ShowUsrPhoto (UsrDat,ShowPhoto ? PhotoURL :
                 	                NULL,
-                     "PHOTO45x60",Pho_ZOOM,NULL);
+                     "PHOTO45x60",Pho_ZOOM,false);
    fprintf (Gbl.F.Out,"</td>");
 
    /***** Start form to go to user's record card *****/
@@ -6597,7 +6597,7 @@ void Tst_ShowOneTestExam (void)
    ShowPhoto = Pho_ShowUsrPhotoIsAllowed (&Gbl.Usrs.Other.UsrDat,PhotoURL);
    Pho_ShowUsrPhoto (&Gbl.Usrs.Other.UsrDat,ShowPhoto ? PhotoURL :
                 	                                NULL,
-                     "PHOTO45x60",Pho_ZOOM,NULL);
+                     "PHOTO45x60",Pho_ZOOM,false);
    fprintf (Gbl.F.Out,"</td>"
 	              "</tr>");
 
diff --git a/swad_timetable.c b/swad_timetable.c
index 572ce6d41..04c18d868 100644
--- a/swad_timetable.c
+++ b/swad_timetable.c
@@ -1207,7 +1207,7 @@ static void TT_TimeTableDrawCell (TT_TimeTableType_t TimeTableType,
 	 /***** Class type *****/
 	 fprintf (Gbl.F.Out,"<select name=\"ModTTCellType\" style=\"width:68px;\""
 	                    " onchange=\"document.getElementById('%s').submit();\">",
-	          Gbl.FormId);
+	          Gbl.Form.Id);
 	 for (CT = (TT_ClassType_t) 0;
 	      CT < (TT_ClassType_t) TT_NUM_CLASS_TYPES;
 	      CT++)
@@ -1245,7 +1245,7 @@ static void TT_TimeTableDrawCell (TT_TimeTableType_t TimeTableType,
 	    /***** Class duration *****/
 	    fprintf (Gbl.F.Out,"<select name=\"ModTTDur\" style=\"width:57px;\""
 		               " onchange=\"document.getElementById('%s').submit();\">",
-		     Gbl.FormId);
+		     Gbl.Form.Id);
             for (H = Hour + TimeTable[Day][Hour].Columns[Column].Duration;
         	 H < TT_HOURS_PER_DAY * 2;
         	 H++)
@@ -1275,7 +1275,7 @@ static void TT_TimeTableDrawCell (TT_TimeTableType_t TimeTableType,
 	                          "<select name=\"ModTTGrpCod\""
 	                          " style=\"width:110px;\""
 		                  " onchange=\"document.getElementById('%s').submit();\">",
-		        Txt_Group,Gbl.FormId);
+		        Txt_Group,Gbl.Form.Id);
                fprintf (Gbl.F.Out,"<option value=\"-1\"");
 	       if (GrpCod <= 0)
 		  fprintf (Gbl.F.Out," selected=\"selected\"");
@@ -1304,7 +1304,7 @@ static void TT_TimeTableDrawCell (TT_TimeTableType_t TimeTableType,
 	                          "<input type=\"text\" name=\"ModHorLugar\""
 	                          " size=\"1\" maxlength=\"%u\" value=\"%s\""
 		                  " onchange=\"document.getElementById('%s').submit();\" />",
-		        Txt_Classroom,TT_MAX_LENGTH_PLACE,Place,Gbl.FormId);
+		        Txt_Classroom,TT_MAX_LENGTH_PLACE,Place,Gbl.Form.Id);
 	      }
 	    else // TimeTableView == TT_TUT_EDIT
 	      {
@@ -1314,7 +1314,7 @@ static void TT_TimeTableDrawCell (TT_TimeTableType_t TimeTableType,
                                   "<input type=\"text\" name=\"ModHorLugar\""
                                   " size=\"12\" maxlength=\"%u\" value=\"%s\""
 		                  " onchange=\"document.getElementById('%s').submit();\" />",
-		        Txt_Place,TT_MAX_LENGTH_PLACE,Place,Gbl.FormId);
+		        Txt_Place,TT_MAX_LENGTH_PLACE,Place,Gbl.Form.Id);
 	      }
 	   }
          fprintf (Gbl.F.Out,"</span>");
diff --git a/swad_user.c b/swad_user.c
index a289cee56..b3c716100 100644
--- a/swad_user.c
+++ b/swad_user.c
@@ -1651,7 +1651,7 @@ void Usr_WriteLoggedUsrHead (void)
    ShowPhoto = Pho_ShowUsrPhotoIsAllowed (&Gbl.Usrs.Me.UsrDat,PhotoURL);
    Pho_ShowUsrPhoto (&Gbl.Usrs.Me.UsrDat,ShowPhoto ? PhotoURL :
                 	                             NULL,
-                     "PHOTO18x24",Pho_ZOOM,NULL);
+                     "PHOTO18x24",Pho_ZOOM,false);
 
    /***** User's name *****/
    fprintf (Gbl.F.Out,"<span class=\"%s\">&nbsp;",
@@ -2705,7 +2705,7 @@ static void Usr_WriteRowGstMainData (unsigned NumUsr,struct UsrData *UsrDat)
       ShowPhoto = Pho_ShowUsrPhotoIsAllowed (UsrDat,PhotoURL);
       Pho_ShowUsrPhoto (UsrDat,ShowPhoto ? PhotoURL :
                                            NULL,
-                        "PHOTO21x28",Pho_ZOOM,NULL);
+                        "PHOTO21x28",Pho_ZOOM,false);
       fprintf (Gbl.F.Out,"</td>");
      }
 
@@ -2807,7 +2807,7 @@ void Usr_WriteRowStdMainData (unsigned NumUsr,struct UsrData *UsrDat,bool PutChe
       ShowPhoto = Pho_ShowUsrPhotoIsAllowed (UsrDat,PhotoURL);
       Pho_ShowUsrPhoto (UsrDat,ShowPhoto ? PhotoURL :
                                            NULL,
-                        "PHOTO21x28",Pho_ZOOM,NULL);
+                        "PHOTO21x28",Pho_ZOOM,false);
       fprintf (Gbl.F.Out,"</td>");
      }
 
@@ -2861,7 +2861,7 @@ static void Usr_WriteRowGstAllData (struct UsrData *UsrDat)
       ShowPhoto = Pho_ShowUsrPhotoIsAllowed (UsrDat,PhotoURL);
       Pho_ShowUsrPhoto (UsrDat,ShowPhoto ? PhotoURL :
                                            NULL,
-                        "PHOTO21x28",Pho_NO_ZOOM,NULL);
+                        "PHOTO21x28",Pho_NO_ZOOM,false);
       fprintf (Gbl.F.Out,"</td>");
      }
 
@@ -2963,7 +2963,7 @@ void Usr_WriteRowStdAllData (struct UsrData *UsrDat,char *GroupNames)
       ShowPhoto = Pho_ShowUsrPhotoIsAllowed (UsrDat,PhotoURL);
       Pho_ShowUsrPhoto (UsrDat,ShowPhoto ? PhotoURL :
                                            NULL,
-                        "PHOTO21x28",Pho_NO_ZOOM,NULL);
+                        "PHOTO21x28",Pho_NO_ZOOM,false);
       fprintf (Gbl.F.Out,"</td>");
      }
 
@@ -3118,7 +3118,7 @@ static void Usr_WriteRowTchMainData (unsigned NumUsr,struct UsrData *UsrDat,bool
       ShowPhoto = Pho_ShowUsrPhotoIsAllowed (UsrDat,PhotoURL);
       Pho_ShowUsrPhoto (UsrDat,ShowPhoto ? PhotoURL :
                                            NULL,
-                        "PHOTO21x28",Pho_ZOOM,NULL);
+                        "PHOTO21x28",Pho_ZOOM,false);
       fprintf (Gbl.F.Out,"</td>");
      }
 
@@ -3174,7 +3174,7 @@ void Usr_WriteRowTchAllData (struct UsrData *UsrDat)
       ShowPhoto = Pho_ShowUsrPhotoIsAllowed (UsrDat,PhotoURL);
       Pho_ShowUsrPhoto (UsrDat,ShowPhoto ? PhotoURL :
                                            NULL,
-                        "PHOTO21x28",Pho_NO_ZOOM,NULL);
+                        "PHOTO21x28",Pho_NO_ZOOM,false);
       fprintf (Gbl.F.Out,"</td>");
      }
 
@@ -3252,7 +3252,7 @@ void Usr_WriteRowAdmData (unsigned NumUsr,struct UsrData *UsrDat)
       ShowPhoto = Pho_ShowUsrPhotoIsAllowed (UsrDat,PhotoURL);
       Pho_ShowUsrPhoto (UsrDat,ShowPhoto ? PhotoURL :
                                            NULL,
-                        "PHOTO21x28",Pho_ZOOM,NULL);
+                        "PHOTO21x28",Pho_ZOOM,false);
       fprintf (Gbl.F.Out,"</td>");
      }
 
@@ -5203,7 +5203,7 @@ static void Usr_PutCheckboxListWithPhotos (void)
       fprintf (Gbl.F.Out," checked=\"checked\"");
    fprintf (Gbl.F.Out," onclick=\"document.getElementById('%s').submit();\" />"
                       "<span class=\"%s\">%s</span>",
-	    Gbl.FormId,
+	    Gbl.Form.Id,
             The_ClassForm[Gbl.Prefs.Theme],Txt_Display_photos);
   }
 
@@ -7311,7 +7311,7 @@ static void Usr_DrawClassPhoto (Usr_ClassPhotoType_t ClassPhotoType,
          ShowPhoto = Pho_ShowUsrPhotoIsAllowed (&UsrDat,PhotoURL);
          Pho_ShowUsrPhoto (&UsrDat,ShowPhoto ? PhotoURL :
                         	               NULL,
-                           ClassPhoto,Pho_ZOOM,NULL);
+                           ClassPhoto,Pho_ZOOM,false);
 
          /***** Photo foot *****/
          fprintf (Gbl.F.Out,"<br />");
@@ -7391,7 +7391,7 @@ void Usr_PutSelectorNumColsClassPhoto (void)
    /***** Start selector *****/
    fprintf (Gbl.F.Out,"<select name=\"ColsClassPhoto\""
                       " onchange=\"document.getElementById('%s').submit();\">",
-            Gbl.FormId);
+            Gbl.Form.Id);
 
    /***** Put a row in selector for every number from 1 to Usr_CLASS_PHOTO_COLS_MAX *****/
    for (Cols = 1;