diff --git a/swad_API.c b/swad_API.c
index a960966c..a75b3919 100644
--- a/swad_API.c
+++ b/swad_API.c
@@ -120,6 +120,7 @@ cp -f /home/acanas/swad/swad/swad /var/www/cgi-bin/
 #include "swad_hierarchy_level.h"
 #include "swad_ID.h"
 #include "swad_mail_database.h"
+#include "swad_mark.h"
 #include "swad_match.h"
 #include "swad_match_database.h"
 #include "swad_message_database.h"
diff --git a/swad_HTML.c b/swad_HTML.c
index d7e394dd..b89fd515 100644
--- a/swad_HTML.c
+++ b/swad_HTML.c
@@ -30,6 +30,7 @@
 #include <stdio.h>		// For vasprintf
 #include <stdlib.h>		// For free
 
+#include "swad_alert.h"
 #include "swad_error.h"
 #include "swad_global.h"
 #include "swad_HTML.h"
diff --git a/swad_ID.c b/swad_ID.c
index 86b41f42..2a31de2f 100644
--- a/swad_ID.c
+++ b/swad_ID.c
@@ -33,6 +33,7 @@
 #include <string.h>		// For string functions
 
 #include "swad_account.h"
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_database.h"
 #include "swad_error.h"
diff --git a/swad_QR.c b/swad_QR.c
index 71f501c0..0504d550 100644
--- a/swad_QR.c
+++ b/swad_QR.c
@@ -30,6 +30,8 @@
 #include <stdlib.h>		// For free
 
 #include "swad_action.h"
+#include "swad_alert.h"
+#include "swad_box.h"
 #include "swad_error.h"
 #include "swad_global.h"
 #include "swad_HTML.h"
diff --git a/swad_action.c b/swad_action.c
index eafade38..f0417c18 100644
--- a/swad_action.c
+++ b/swad_action.c
@@ -90,6 +90,7 @@
 #include "swad_password.h"
 #include "swad_photo.h"
 #include "swad_place.h"
+#include "swad_plugin.h"
 #include "swad_privacy.h"
 #include "swad_profile.h"
 #include "swad_program.h"
@@ -101,6 +102,7 @@
 #include "swad_report.h"
 #include "swad_role.h"
 #include "swad_search.h"
+#include "swad_session.h"
 #include "swad_setting.h"
 #include "swad_survey.h"
 #include "swad_survey_resource.h"
diff --git a/swad_admin.c b/swad_admin.c
index 2c7b5d09..384a373d 100644
--- a/swad_admin.c
+++ b/swad_admin.c
@@ -29,6 +29,7 @@
 
 #include "swad_admin.h"
 #include "swad_admin_database.h"
+#include "swad_alert.h"
 #include "swad_global.h"
 #include "swad_user_database.h"
 
diff --git a/swad_announcement.c b/swad_announcement.c
index 3f8bcc95..73f12bb5 100644
--- a/swad_announcement.c
+++ b/swad_announcement.c
@@ -25,6 +25,7 @@
 /*********************************** Headers *********************************/
 /*****************************************************************************/
 
+#include "swad_alert.h"
 #include "swad_announcement.h"
 #include "swad_announcement_database.h"
 #include "swad_autolink.h"
diff --git a/swad_banner.c b/swad_banner.c
index 3cb57384..de5c3d07 100644
--- a/swad_banner.c
+++ b/swad_banner.c
@@ -29,6 +29,7 @@
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
 #include "swad_banner.h"
 #include "swad_banner_database.h"
 #include "swad_box.h"
diff --git a/swad_browser.c b/swad_browser.c
index cc1a5fd7..cdba852f 100644
--- a/swad_browser.c
+++ b/swad_browser.c
@@ -38,6 +38,7 @@
 #include <time.h>		// For time
 #include <unistd.h>		// For access, lstat, getpid, chdir, symlink
 
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_browser.h"
 #include "swad_browser_database.h"
diff --git a/swad_browser_resource.c b/swad_browser_resource.c
index 65676ede..11661aaa 100644
--- a/swad_browser_resource.c
+++ b/swad_browser_resource.c
@@ -25,6 +25,7 @@
 /*****************************************************************************/
 
 #include "swad_action.h"
+#include "swad_alert.h"
 #include "swad_browser.h"
 #include "swad_browser_resource.h"
 #include "swad_error.h"
diff --git a/swad_building.c b/swad_building.c
index 175f337f..50036716 100644
--- a/swad_building.c
+++ b/swad_building.c
@@ -29,6 +29,7 @@
 #include <stddef.h>		// For NULL
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_building.h"
 #include "swad_building_database.h"
@@ -37,6 +38,7 @@
 #include "swad_form.h"
 #include "swad_global.h"
 #include "swad_HTML.h"
+#include "swad_parameter.h"
 #include "swad_room_database.h"
 
 /*****************************************************************************/
diff --git a/swad_call_for_exam.c b/swad_call_for_exam.c
index be8c7e71..8d3ba198 100644
--- a/swad_call_for_exam.c
+++ b/swad_call_for_exam.c
@@ -31,6 +31,7 @@
 #include <stdlib.h>		// For exit, system, malloc, calloc, free, etc.
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_call_for_exam.h"
 #include "swad_call_for_exam_database.h"
diff --git a/swad_center.c b/swad_center.c
index dfec4973..94b94430 100644
--- a/swad_center.c
+++ b/swad_center.c
@@ -33,6 +33,7 @@
 #include <string.h>		// For string functions
 
 #include "swad_admin_database.h"
+#include "swad_box.h"
 #include "swad_browser_database.h"
 #include "swad_center.h"
 #include "swad_center_config.h"
@@ -50,6 +51,7 @@
 #include "swad_HTML.h"
 #include "swad_logo.h"
 #include "swad_message.h"
+#include "swad_parameter.h"
 #include "swad_place.h"
 #include "swad_room_database.h"
 #include "swad_survey.h"
diff --git a/swad_center_config.c b/swad_center_config.c
index 397ec06c..492eb031 100644
--- a/swad_center_config.c
+++ b/swad_center_config.c
@@ -33,6 +33,8 @@
 #include <string.h>		// For string functions
 #include <unistd.h>		// For unlink
 
+#include "swad_alert.h"
+#include "swad_box.h"
 #include "swad_center.h"
 #include "swad_center_database.h"
 #include "swad_database.h"
@@ -46,6 +48,7 @@
 #include "swad_hierarchy_level.h"
 #include "swad_HTML.h"
 #include "swad_logo.h"
+#include "swad_parameter.h"
 #include "swad_place.h"
 
 /*****************************************************************************/
diff --git a/swad_center_database.c b/swad_center_database.c
index ca94ffbb..7cee7837 100644
--- a/swad_center_database.c
+++ b/swad_center_database.c
@@ -36,6 +36,7 @@
 #include "swad_global.h"
 #include "swad_hierarchy.h"
 #include "swad_hierarchy_database.h"
+#include "swad_media.h"
 #include "swad_search.h"
 
 /*****************************************************************************/
diff --git a/swad_changelog.h b/swad_changelog.h
index 37cced2e..1168bc9e 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -606,10 +606,11 @@ TODO: Fix bug: error al enviar un mensaje a dos recipientes, error on duplicate
 
 TODO: Attach pdf files in multimedia.
 */
-#define Log_PLATFORM_VERSION	"SWAD 22.50.1 (2022-10-19)"
+#define Log_PLATFORM_VERSION	"SWAD 22.50.2 (2022-10-19)"
 #define CSS_FILE		"swad22.49.4.css"
 #define JS_FILE			"swad22.49.js"
 /*
+	Version 22.50.2:  Oct 19, 2022  Code refactoring related to dates. (333456 lines)
 	Version 22.50.1:  Oct 19, 2022  Code refactoring related to dates. (333332 lines)
 	Version 22.50:    Oct 19, 2022  Code refactoring related to dates. (333318 lines)
 	Version 22.49.9:  Oct 18, 2022  Code refactoring related to XML. (333257 lines)
diff --git a/swad_chat.c b/swad_chat.c
index 4a795f3c..9de33241 100644
--- a/swad_chat.c
+++ b/swad_chat.c
@@ -29,6 +29,7 @@
 #include <stdbool.h>		// For boolean type
 #include <string.h>
 
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_chat.h"
 #include "swad_chat_database.h"
diff --git a/swad_connected.c b/swad_connected.c
index c7cfa010..d68aa2cf 100644
--- a/swad_connected.c
+++ b/swad_connected.c
@@ -72,7 +72,7 @@ static void Con_ShowConnectedUsrsWithARoleBelongingToCurrentCrsOnRightColumn (Ro
 static unsigned Con_GetConnectedUsrsTotal (Rol_Role_t Role);
 
 static void Con_GetNumConnectedWithARoleBelongingToCurrentScope (Rol_Role_t Role,
-                                                                 struct ConnectedUsrs *Usrs);
+                                                                 struct Con_ConnectedUsrs *Usrs);
 static void Con_ComputeConnectedUsrsWithARoleCurrentCrsOneByOne (Rol_Role_t Role);
 static void Con_ShowConnectedUsrsCurrentCrsOneByOneOnRightColumn (Rol_Role_t Role);
 static void Con_WriteRowConnectedUsrOnRightColumn (Rol_Role_t Role);
@@ -267,7 +267,7 @@ static void Con_ComputeConnectedUsrsWithARoleBelongingToCurrentCrs (Rol_Role_t R
 static void Con_ShowConnectedUsrsBelongingToLocation (void)
   {
    extern const char *Txt_from;
-   struct ConnectedUsrs Usrs;
+   struct Con_ConnectedUsrs Usrs;
 
    /***** Begin container *****/
    HTM_DIV_Begin ("class=\"CON CON_%s\"",
@@ -312,7 +312,7 @@ void Con_ShowConnectedUsrsBelongingToCurrentCrs (void)
    extern const char *Txt_Connected_users;
    extern const char *Txt_from;
    char CourseName[Cns_HIERARCHY_MAX_BYTES_SHRT_NAME + 1];
-   struct ConnectedUsrs Usrs;
+   struct Con_ConnectedUsrs Usrs;
 
    /***** Trivial check *****/
    if (Gbl.Hierarchy.Crs.CrsCod <= 0)	// No course selected
@@ -354,7 +354,7 @@ static void Con_ShowConnectedUsrsWithARoleBelongingToCurrentLocationOnMainZone (
   {
    extern const char *Txt_ROLES_SINGUL_abc[Rol_NUM_ROLES][Usr_NUM_SEXS];
    extern const char *Txt_ROLES_PLURAL_abc[Rol_NUM_ROLES][Usr_NUM_SEXS];
-   struct ConnectedUsrs Usrs;
+   struct Con_ConnectedUsrs Usrs;
 
    /***** Write number of connected users who belong to current course *****/
    Con_GetNumConnectedWithARoleBelongingToCurrentScope (Role,&Usrs);
@@ -442,7 +442,7 @@ static unsigned Con_GetConnectedUsrsTotal (Rol_Role_t Role)
 // Return user's sex in UsrSex
 
 static void Con_GetNumConnectedWithARoleBelongingToCurrentScope (Rol_Role_t Role,
-                                                                 struct ConnectedUsrs *Usrs)
+                                                                 struct Con_ConnectedUsrs *Usrs)
   {
    extern const char *Usr_StringsSexDB[Usr_NUM_SEXS];
    MYSQL_RES *mysql_res;
diff --git a/swad_connected.h b/swad_connected.h
index d6cbc92a..47c0e3b6 100644
--- a/swad_connected.h
+++ b/swad_connected.h
@@ -40,7 +40,7 @@
 /******************************** Public types *******************************/
 /*****************************************************************************/
 
-struct ConnectedUsrs
+struct Con_ConnectedUsrs
   {
    unsigned NumUsrs;
    Usr_Sex_t Sex;
diff --git a/swad_cookie.c b/swad_cookie.c
index 50946172..cb4ccd8f 100644
--- a/swad_cookie.c
+++ b/swad_cookie.c
@@ -39,6 +39,7 @@
 #include "swad_global.h"
 #include "swad_HTML.h"
 #include "swad_layout.h"
+#include "swad_parameter.h"
 #include "swad_setting.h"
 #include "swad_user_database.h"
 
diff --git a/swad_country.c b/swad_country.c
index 6943de5d..0599f52f 100644
--- a/swad_country.c
+++ b/swad_country.c
@@ -32,6 +32,8 @@
 #include <stdlib.h>		// For free
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
+#include "swad_box.h"
 #include "swad_country_config.h"
 #include "swad_country_database.h"
 #include "swad_database.h"
@@ -43,6 +45,7 @@
 #include "swad_hierarchy.h"
 #include "swad_hierarchy_level.h"
 #include "swad_HTML.h"
+#include "swad_parameter.h"
 #include "swad_survey.h"
 
 /*****************************************************************************/
diff --git a/swad_country_config.c b/swad_country_config.c
index 0fcb6199..87694bcf 100644
--- a/swad_country_config.c
+++ b/swad_country_config.c
@@ -32,6 +32,7 @@
 #include <stdlib.h>		// For free
 #include <string.h>		// For string functions
 
+#include "swad_box.h"
 #include "swad_country_config.h"
 #include "swad_country_database.h"
 #include "swad_database.h"
@@ -44,6 +45,7 @@
 #include "swad_hierarchy_config.h"
 #include "swad_hierarchy_level.h"
 #include "swad_HTML.h"
+#include "swad_parameter.h"
 
 /*****************************************************************************/
 /************** External global variables from others modules ****************/
diff --git a/swad_course.c b/swad_course.c
index dda11030..df2e68f8 100644
--- a/swad_course.c
+++ b/swad_course.c
@@ -32,6 +32,7 @@
 #include <string.h>		// For string functions
 
 #include "swad_attendance.h"
+#include "swad_box.h"
 #include "swad_browser_database.h"
 #include "swad_call_for_exam_database.h"
 #include "swad_center_database.h"
@@ -60,6 +61,7 @@
 #include "swad_notice.h"
 #include "swad_notice_database.h"
 #include "swad_notification_database.h"
+#include "swad_parameter.h"
 #include "swad_project.h"
 #include "swad_record_database.h"
 #include "swad_search.h"
diff --git a/swad_course.h b/swad_course.h
index 1674e7d0..013d6334 100644
--- a/swad_course.h
+++ b/swad_course.h
@@ -64,7 +64,7 @@ struct Crs_Course
    char FullName[Cns_HIERARCHY_MAX_BYTES_FULL_NAME + 1];	// Full name of course
   };
 
-struct ListCourses
+struct Crs_ListCourses
   {
    unsigned Num;	// Number of courses
    struct Crs_Course *Lst;	// List of courses
diff --git a/swad_course_config.c b/swad_course_config.c
index 03d2774e..98f35a3d 100644
--- a/swad_course_config.c
+++ b/swad_course_config.c
@@ -32,6 +32,8 @@
 #include <stdlib.h>		// For free
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
+#include "swad_box.h"
 #include "swad_course_database.h"
 #include "swad_database.h"
 #include "swad_error.h"
@@ -43,6 +45,7 @@
 #include "swad_HTML.h"
 #include "swad_indicator.h"
 #include "swad_logo.h"
+#include "swad_parameter.h"
 #include "swad_role.h"
 
 /*****************************************************************************/
diff --git a/swad_database.c b/swad_database.c
index 9a250647..e822b939 100644
--- a/swad_database.c
+++ b/swad_database.c
@@ -34,6 +34,7 @@
 #include <stdlib.h>		// For free
 #include <string.h>		// For strlen
 
+#include "swad_alert.h"
 #include "swad_config.h"
 #include "swad_database.h"
 #include "swad_error.h"
diff --git a/swad_degree.c b/swad_degree.c
index 3a80dae7..b0b83ad0 100644
--- a/swad_degree.c
+++ b/swad_degree.c
@@ -33,6 +33,7 @@
 #include <string.h>		// For string functions
 
 #include "swad_admin_database.h"
+#include "swad_box.h"
 #include "swad_browser_database.h"
 #include "swad_course_database.h"
 #include "swad_database.h"
@@ -50,6 +51,7 @@
 #include "swad_HTML.h"
 #include "swad_logo.h"
 #include "swad_message.h"
+#include "swad_parameter.h"
 #include "swad_photo_database.h"
 #include "swad_survey.h"
 
diff --git a/swad_degree_config.c b/swad_degree_config.c
index 6c3d4cb6..0382d353 100644
--- a/swad_degree_config.c
+++ b/swad_degree_config.c
@@ -30,6 +30,8 @@
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For free
 
+#include "swad_alert.h"
+#include "swad_box.h"
 #include "swad_database.h"
 #include "swad_degree_config.h"
 #include "swad_degree_database.h"
@@ -42,6 +44,7 @@
 #include "swad_hierarchy_level.h"
 #include "swad_HTML.h"
 #include "swad_logo.h"
+#include "swad_parameter.h"
 
 /*****************************************************************************/
 /************** External global variables from others modules ****************/
diff --git a/swad_degree_type.c b/swad_degree_type.c
index 282aad77..fda9b527 100644
--- a/swad_degree_type.c
+++ b/swad_degree_type.c
@@ -32,6 +32,7 @@
 #include <string.h>		// For string functions
 #include <mysql/mysql.h>	// To access MySQL databases
 
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_config.h"
 #include "swad_database.h"
diff --git a/swad_department.c b/swad_department.c
index 2dd1d325..745868ba 100644
--- a/swad_department.c
+++ b/swad_department.c
@@ -32,6 +32,7 @@
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_constant.h"
 #include "swad_database.h"
diff --git a/swad_duplicate.c b/swad_duplicate.c
index f94a837e..f34731e4 100644
--- a/swad_duplicate.c
+++ b/swad_duplicate.c
@@ -26,6 +26,7 @@
 /*****************************************************************************/
 
 #include "swad_account.h"
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_database.h"
 #include "swad_duplicate.h"
@@ -37,6 +38,7 @@
 #include "swad_global.h"
 #include "swad_HTML.h"
 #include "swad_layout.h"
+#include "swad_parameter.h"
 #include "swad_profile.h"
 #include "swad_role_type.h"
 #include "swad_user.h"
diff --git a/swad_enrolment.c b/swad_enrolment.c
index 47bb8293..8d4d0482 100644
--- a/swad_enrolment.c
+++ b/swad_enrolment.c
@@ -34,6 +34,7 @@
 #include "swad_account_database.h"
 #include "swad_admin.h"
 #include "swad_admin_database.h"
+#include "swad_alert.h"
 #include "swad_announcement.h"
 #include "swad_attendance_database.h"
 #include "swad_box.h"
diff --git a/swad_error.c b/swad_error.c
index 745cab12..9a84fe81 100644
--- a/swad_error.c
+++ b/swad_error.c
@@ -27,6 +27,7 @@
 
 #include <stdlib.h>	// For exit
 
+#include "swad_alert.h"
 #include "swad_database.h"
 #include "swad_error.h"
 #include "swad_global.h"
diff --git a/swad_exam.c b/swad_exam.c
index 94eb5cd6..93f9ee82 100644
--- a/swad_exam.c
+++ b/swad_exam.c
@@ -34,6 +34,7 @@
 #include <string.h>		// For string functions
 
 #include "swad_autolink.h"
+#include "swad_box.h"
 #include "swad_database.h"
 #include "swad_error.h"
 #include "swad_exam.h"
@@ -51,6 +52,7 @@
 #include "swad_match.h"
 #include "swad_match_result.h"
 #include "swad_pagination.h"
+#include "swad_parameter.h"
 #include "swad_program_database.h"
 #include "swad_role.h"
 #include "swad_test.h"
diff --git a/swad_exam_log.c b/swad_exam_log.c
index 5ab6cd3f..7ae3bedd 100644
--- a/swad_exam_log.c
+++ b/swad_exam_log.c
@@ -31,6 +31,7 @@
 #include <string.h>		// For string functions
 
 #include "swad_action.h"
+#include "swad_box.h"
 #include "swad_database.h"
 #include "swad_error.h"
 #include "swad_exam_database.h"
diff --git a/swad_exam_print.c b/swad_exam_print.c
index 7850add9..c730ff60 100644
--- a/swad_exam_print.c
+++ b/swad_exam_print.c
@@ -31,6 +31,7 @@
 #include <stdio.h>		// For asprintf
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
 #include "swad_autolink.h"
 #include "swad_box.h"
 #include "swad_database.h"
@@ -46,6 +47,7 @@
 #include "swad_form.h"
 #include "swad_global.h"
 #include "swad_ID.h"
+#include "swad_parameter.h"
 #include "swad_photo.h"
 
 /*****************************************************************************/
diff --git a/swad_exam_result.c b/swad_exam_result.c
index 2794b6e7..c4ea3f77 100644
--- a/swad_exam_result.c
+++ b/swad_exam_result.c
@@ -33,6 +33,7 @@
 #include <string.h>		// For string functions
 
 #include "swad_action.h"
+#include "swad_box.h"
 #include "swad_database.h"
 #include "swad_date.h"
 #include "swad_error.h"
@@ -48,6 +49,7 @@
 #include "swad_global.h"
 #include "swad_HTML.h"
 #include "swad_ID.h"
+#include "swad_parameter.h"
 #include "swad_photo.h"
 #include "swad_test_print.h"
 #include "swad_test_visibility.h"
diff --git a/swad_exam_session.c b/swad_exam_session.c
index eb1f4a57..dc8a6500 100644
--- a/swad_exam_session.c
+++ b/swad_exam_session.c
@@ -32,6 +32,8 @@
 #include <stdlib.h>		// For free
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
+#include "swad_box.h"
 #include "swad_database.h"
 #include "swad_date.h"
 #include "swad_error.h"
@@ -46,6 +48,7 @@
 #include "swad_global.h"
 #include "swad_group_database.h"
 #include "swad_HTML.h"
+#include "swad_parameter.h"
 #include "swad_role.h"
 #include "swad_setting.h"
 #include "swad_test.h"
diff --git a/swad_exam_set.c b/swad_exam_set.c
index 19e5506c..9bc22e27 100644
--- a/swad_exam_set.c
+++ b/swad_exam_set.c
@@ -33,6 +33,7 @@
 #include <stdlib.h>		// For free
 #include <string.h>		// For string functions
 
+#include "swad_box.h"
 #include "swad_database.h"
 #include "swad_error.h"
 #include "swad_exam.h"
@@ -48,6 +49,7 @@
 #include "swad_match.h"
 #include "swad_match_result.h"
 #include "swad_pagination.h"
+#include "swad_parameter.h"
 #include "swad_question_database.h"
 #include "swad_role.h"
 #include "swad_test.h"
diff --git a/swad_figure.c b/swad_figure.c
index 2843f9e4..d59d139e 100644
--- a/swad_figure.c
+++ b/swad_figure.c
@@ -30,16 +30,19 @@
 #include "swad_box.h"
 #include "swad_calendar.h"
 #include "swad_cookie.h"
+#include "swad_degree_type.h"
 #include "swad_exam.h"
 #include "swad_figure.h"
 #include "swad_follow.h"
 #include "swad_form.h"
+#include "swad_forum.h"
 #include "swad_global.h"
 #include "swad_hierarchy.h"
 #include "swad_HTML.h"
 #include "swad_message.h"
 #include "swad_network.h"
 #include "swad_notice.h"
+#include "swad_parameter.h"
 #include "swad_privacy.h"
 #include "swad_program.h"
 #include "swad_project.h"
diff --git a/swad_file.c b/swad_file.c
index 0ae99c34..ba733df6 100644
--- a/swad_file.c
+++ b/swad_file.c
@@ -43,6 +43,7 @@
 #include "swad_global.h"
 #include "swad_file.h"
 #include "swad_file_database.h"
+#include "swad_parameter.h"
 #include "swad_string.h"
 
 /*****************************************************************************/
diff --git a/swad_file.h b/swad_file.h
index 8463fa1e..86951dfc 100644
--- a/swad_file.h
+++ b/swad_file.h
@@ -45,7 +45,7 @@
 #define Fil_MAX_FILE_SIZE (2000ULL * 1024ULL * 1024ULL)	// 2000 MiB = 1.95 GiB
 
 // Global files
-struct Files
+struct Fil_Files
   {
    FILE *Out;		// File with the HTML output of this CGI
    FILE *Tmp;		// Temporary file to save stdin
diff --git a/swad_follow.c b/swad_follow.c
index 7bfd8173..acdce4df 100644
--- a/swad_follow.c
+++ b/swad_follow.c
@@ -30,6 +30,7 @@
 #include <stdio.h>		// For asprintf
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_database.h"
 #include "swad_error.h"
@@ -41,6 +42,7 @@
 #include "swad_HTML.h"
 #include "swad_notification.h"
 #include "swad_notification_database.h"
+#include "swad_parameter.h"
 #include "swad_photo.h"
 #include "swad_privacy.h"
 #include "swad_profile.h"
diff --git a/swad_game.c b/swad_game.c
index e6211c97..7e2ee7db 100644
--- a/swad_game.c
+++ b/swad_game.c
@@ -34,6 +34,7 @@
 #include <string.h>		// For string functions
 
 #include "swad_autolink.h"
+#include "swad_box.h"
 #include "swad_database.h"
 #include "swad_error.h"
 #include "swad_figure.h"
@@ -47,6 +48,7 @@
 #include "swad_match_database.h"
 #include "swad_match_result.h"
 #include "swad_pagination.h"
+#include "swad_parameter.h"
 #include "swad_program_database.h"
 #include "swad_role.h"
 #include "swad_test.h"
diff --git a/swad_global.c b/swad_global.c
index e4566e86..ad8debfb 100644
--- a/swad_global.c
+++ b/swad_global.c
@@ -39,6 +39,7 @@
 #include "swad_call_for_exam.h"
 #include "swad_config.h"
 #include "swad_constant.h"
+#include "swad_degree_type.h"
 #include "swad_department.h"
 #include "swad_follow.h"
 #include "swad_global.h"
@@ -47,6 +48,7 @@
 #include "swad_icon.h"
 #include "swad_link.h"
 #include "swad_parameter.h"
+#include "swad_plugin.h"
 #include "swad_program.h"
 #include "swad_project.h"
 #include "swad_role.h"
diff --git a/swad_global.h b/swad_global.h
index c4bf112d..f61018d6 100644
--- a/swad_global.h
+++ b/swad_global.h
@@ -32,34 +32,17 @@
 #include <sys/time.h>		// For tz
 #include <mysql/mysql.h>	// To access MySQL databases
 
-#include "swad_alert.h"
 #include "swad_API.h"
 #include "swad_assignment.h"
-#include "swad_box.h"
 #include "swad_browser.h"
-#include "swad_center.h"
 #include "swad_connected.h"
 #include "swad_config.h"
-#include "swad_country.h"
 #include "swad_course.h"
-#include "swad_cryptography.h"
-#include "swad_degree_type.h"
 #include "swad_enrolment.h"
 #include "swad_file.h"
-#include "swad_icon.h"
-#include "swad_institution.h"
-#include "swad_layout.h"
+#include "swad_group.h"
 #include "swad_mail.h"
-#include "swad_mark.h"
-#include "swad_media.h"
-#include "swad_menu.h"
-#include "swad_parameter.h"
-#include "swad_password.h"
-#include "swad_plugin.h"
 #include "swad_record.h"
-#include "swad_search.h"
-#include "swad_session.h"
-#include "swad_setting.h"
 
 /*****************************************************************************/
 /******************************* Public types ********************************/
@@ -72,10 +55,10 @@ struct Globals
       char DatabasePassword[Cfg_MAX_BYTES_DATABASE_PASSWORD + 1];
       char SMTPPassword[Cfg_MAX_BYTES_SMTP_PASSWORD + 1];
      } Config;
-
-   struct Files F;
+   struct Fil_Files F;
    pid_t PID;	// PID of current process
-
+   char IP[Cns_MAX_BYTES_IP + 1];
+   char UniqueNameEncrypted[Cry_BYTES_ENCRYPTED_STR_SHA256_BASE64 + 1];	// Used for session id, temporary directory names, etc.
    struct
      {
       bool WritingHTMLStart;	// Used to avoid writing the HTML head when aborting program on error
@@ -84,9 +67,6 @@ struct Globals
       bool HTMLEndWritten;	// Used to avoid writing more than once the HTML end
      } Layout;
 
-   char IP[Cns_MAX_BYTES_IP + 1];
-   char UniqueNameEncrypted[Cry_BYTES_ENCRYPTED_STR_SHA256_BASE64 + 1];	// Used for session id, temporary directory names, etc.
-
    struct
      {
       Lan_Language_t Language;
@@ -98,7 +78,6 @@ struct Globals
       unsigned SideCols;
       PhoSha_Shape_t PhotoShape;
      } Prefs;
-
    struct
      {
       unsigned NumSessions;
@@ -108,7 +87,6 @@ struct Globals
       long UsrCod;
       bool ParamsInsertedIntoDB;	// If parameters are inserted in the database in this session
      } Session;
-
    struct
      {
       Tab_Tab_t Tab;
@@ -117,7 +95,6 @@ struct Globals
       bool UsesAJAX;		// Do not generate full HTML page, only the content of a div
       bool IsAJAXAutoRefresh;	// It's an automatic refresh drom time to time
      } Action;
-
    struct
      {
       HieLvl_Level_t Level;	// Current level in the hierarchy: system, country, institution, center, degree or course
@@ -130,7 +107,7 @@ struct Globals
       struct Ctr_Center Ctr;	// Current center
       struct ListDegrees Degs;	// List of degrees in current center
       struct Deg_Degree Deg;	// Current degree
-      struct ListCourses Crss;	// List of courses in current degree
+      struct Crs_ListCourses Crss;	// List of courses in current degree
       struct Crs_Course Crs;	// Current course. Aditional info about course is stored in Gbl.Crs.
      } Hierarchy;
    struct
@@ -155,10 +132,10 @@ struct Globals
       char Str[Sch_MAX_BYTES_STRING_TO_FIND + 1];
       bool LogSearch;
      } Search;
-  struct
+   struct
      {
       unsigned Num;		// Number of plugins
-      struct Plugin *Lst;	// List of plugins
+      struct Plg_Plugin *Lst;	// List of plugins
      } Plugins;
    struct
      {
@@ -276,7 +253,7 @@ struct Globals
          unsigned NumUsr;
          unsigned NumUsrs;
          unsigned NumUsrsToList;
-         struct ConnectedUsrs Usrs[Rol_NUM_ROLES];
+         struct Con_ConnectedUsrs Usrs[Rol_NUM_ROLES];
          struct
            {
             long UsrCod;
diff --git a/swad_group.c b/swad_group.c
index ef225d3b..4237540d 100644
--- a/swad_group.c
+++ b/swad_group.c
@@ -32,6 +32,7 @@
 #include <string.h>		// For string functions
 
 #include "swad_action.h"
+#include "swad_alert.h"
 #include "swad_assignment_database.h"
 #include "swad_attendance_database.h"
 #include "swad_box.h"
diff --git a/swad_help.c b/swad_help.c
index 9bf93bce..d6a41915 100644
--- a/swad_help.c
+++ b/swad_help.c
@@ -30,6 +30,7 @@
 #include <stdlib.h>		// For free
 
 #include "swad_action.h"
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_config.h"
 #include "swad_error.h"
diff --git a/swad_hierarchy.c b/swad_hierarchy.c
index a39e658b..b95cd998 100644
--- a/swad_hierarchy.c
+++ b/swad_hierarchy.c
@@ -29,6 +29,7 @@
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For free
 
+#include "swad_box.h"
 #include "swad_database.h"
 #include "swad_degree_database.h"
 #include "swad_error.h"
@@ -41,6 +42,7 @@
 #include "swad_hierarchy_level.h"
 #include "swad_HTML.h"
 #include "swad_logo.h"
+#include "swad_parameter.h"
 
 /*****************************************************************************/
 /************** External global variables from others modules ****************/
diff --git a/swad_holiday.c b/swad_holiday.c
index fd071789..153cca04 100644
--- a/swad_holiday.c
+++ b/swad_holiday.c
@@ -29,6 +29,7 @@
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_calendar.h"
 #include "swad_database.h"
diff --git a/swad_indicator.c b/swad_indicator.c
index 628d506a..d4fc874a 100644
--- a/swad_indicator.c
+++ b/swad_indicator.c
@@ -36,6 +36,7 @@
 #include "swad_box.h"
 #include "swad_browser_database.h"
 #include "swad_database.h"
+#include "swad_degree_type.h"
 #include "swad_department.h"
 #include "swad_error.h"
 #include "swad_form.h"
diff --git a/swad_info.c b/swad_info.c
index b6a9d33a..1f35e25a 100644
--- a/swad_info.c
+++ b/swad_info.c
@@ -34,6 +34,7 @@
 #include <unistd.h>		// For unlink
 
 #include "swad_action.h"
+#include "swad_alert.h"
 #include "swad_autolink.h"
 #include "swad_box.h"
 #include "swad_database.h"
diff --git a/swad_institution.c b/swad_institution.c
index f6b73866..bfe8689c 100644
--- a/swad_institution.c
+++ b/swad_institution.c
@@ -33,6 +33,7 @@
 #include <string.h>		// For string functions
 
 #include "swad_admin_database.h"
+#include "swad_box.h"
 #include "swad_browser_database.h"
 #include "swad_center_database.h"
 #include "swad_database.h"
@@ -51,6 +52,7 @@
 #include "swad_institution_database.h"
 #include "swad_logo.h"
 #include "swad_message.h"
+#include "swad_parameter.h"
 #include "swad_place.h"
 #include "swad_survey.h"
 
diff --git a/swad_institution_config.c b/swad_institution_config.c
index 4a85ec05..d635b09f 100644
--- a/swad_institution_config.c
+++ b/swad_institution_config.c
@@ -31,6 +31,8 @@
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For free
 
+#include "swad_alert.h"
+#include "swad_box.h"
 #include "swad_center_database.h"
 #include "swad_database.h"
 #include "swad_department_database.h"
@@ -46,6 +48,7 @@
 #include "swad_institution.h"
 #include "swad_institution_database.h"
 #include "swad_logo.h"
+#include "swad_parameter.h"
 #include "swad_place.h"
 
 /*****************************************************************************/
diff --git a/swad_language.c b/swad_language.c
index 8f50dc99..92216fb4 100644
--- a/swad_language.c
+++ b/swad_language.c
@@ -30,6 +30,7 @@
 #include <stdlib.h>		// For free
 #include <string.h>		// For strcasecmp
 
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_database.h"
 #include "swad_error.h"
@@ -38,6 +39,7 @@
 #include "swad_global.h"
 #include "swad_HTML.h"
 #include "swad_language.h"
+#include "swad_parameter.h"
 #include "swad_setting.h"
 #include "swad_setting_database.h"
 #include "swad_user_database.h"
diff --git a/swad_link.c b/swad_link.c
index 2dc9ace5..5729f60e 100644
--- a/swad_link.c
+++ b/swad_link.c
@@ -29,6 +29,7 @@
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
 #include "swad_banner.h"
 #include "swad_box.h"
 #include "swad_constant.h"
diff --git a/swad_log.c b/swad_log.c
index a9d19bb6..ecc52b62 100644
--- a/swad_log.c
+++ b/swad_log.c
@@ -30,6 +30,7 @@
 
 #include "swad_action.h"
 #include "swad_banner.h"
+#include "swad_box.h"
 #include "swad_center_database.h"
 #include "swad_config.h"
 #include "swad_database.h"
diff --git a/swad_logo.c b/swad_logo.c
index 9704c90e..244ebc6a 100644
--- a/swad_logo.c
+++ b/swad_logo.c
@@ -31,6 +31,7 @@
 #include <string.h>		// For string functions
 
 #include "swad_action.h"
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_degree_database.h"
 #include "swad_center_database.h"
diff --git a/swad_mail.c b/swad_mail.c
index c1181e49..24eece77 100644
--- a/swad_mail.c
+++ b/swad_mail.c
@@ -34,6 +34,7 @@
 #include <unistd.h>		// For access, lstat, getpid, chdir, symlink, unlink
 
 #include "swad_account.h"
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_database.h"
 #include "swad_error.h"
diff --git a/swad_main.c b/swad_main.c
index bbdfb455..277ec82f 100644
--- a/swad_main.c
+++ b/swad_main.c
@@ -44,6 +44,7 @@
 #include "swad_MFU.h"
 #include "swad_notification.h"
 #include "swad_parameter.h"
+#include "swad_session.h"
 #include "swad_session_database.h"
 #include "swad_setting.h"
 #include "swad_user.h"
diff --git a/swad_mark.c b/swad_mark.c
index 22a1e13e..1668fefa 100644
--- a/swad_mark.c
+++ b/swad_mark.c
@@ -33,6 +33,7 @@
 #include <string.h>		// For string functions
 #include <unistd.h>		// For unlink
 
+#include "swad_alert.h"
 #include "swad_database.h"
 #include "swad_enrolment_database.h"
 #include "swad_error.h"
diff --git a/swad_match.c b/swad_match.c
index ea2bb578..a066ba85 100644
--- a/swad_match.c
+++ b/swad_match.c
@@ -32,6 +32,8 @@
 #include <stdlib.h>		// For free
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
+#include "swad_box.h"
 #include "swad_database.h"
 #include "swad_date.h"
 #include "swad_error.h"
@@ -44,6 +46,7 @@
 #include "swad_match.h"
 #include "swad_match_database.h"
 #include "swad_match_result.h"
+#include "swad_parameter.h"
 #include "swad_question_database.h"
 #include "swad_role.h"
 #include "swad_setting.h"
diff --git a/swad_match_result.c b/swad_match_result.c
index e30835e5..74a567ac 100644
--- a/swad_match_result.c
+++ b/swad_match_result.c
@@ -33,6 +33,7 @@
 #include <string.h>		// For string functions
 
 #include "swad_action.h"
+#include "swad_box.h"
 #include "swad_database.h"
 #include "swad_date.h"
 #include "swad_error.h"
@@ -43,6 +44,7 @@
 #include "swad_match.h"
 #include "swad_match_database.h"
 #include "swad_match_result.h"
+#include "swad_parameter.h"
 #include "swad_photo.h"
 #include "swad_test_visibility.h"
 #include "swad_user.h"
diff --git a/swad_media.c b/swad_media.c
index d7140a53..dc3a5d93 100644
--- a/swad_media.c
+++ b/swad_media.c
@@ -36,6 +36,7 @@
 #include <sys/wait.h>		// For the macro WEXITSTATUS
 #include <unistd.h>		// For unlink, lstat
 
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_browser.h"
 #include "swad_config.h"
@@ -48,6 +49,7 @@
 #include "swad_HTML.h"
 #include "swad_media.h"
 #include "swad_media_database.h"
+#include "swad_parameter.h"
 
 /*****************************************************************************/
 /***************************** Private constants *****************************/
diff --git a/swad_message.c b/swad_message.c
index 69ff7448..62ded96f 100644
--- a/swad_message.c
+++ b/swad_message.c
@@ -49,6 +49,7 @@
 #include "swad_hierarchy_level.h"
 #include "swad_HTML.h"
 #include "swad_ID.h"
+#include "swad_media.h"
 #include "swad_message.h"
 #include "swad_message_database.h"
 #include "swad_nickname_database.h"
diff --git a/swad_nickname.c b/swad_nickname.c
index b366f02a..b1f409f3 100644
--- a/swad_nickname.c
+++ b/swad_nickname.c
@@ -28,6 +28,7 @@
 #include <string.h>		// For string functions
 
 #include "swad_account.h"
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_database.h"
 #include "swad_form.h"
diff --git a/swad_notice.c b/swad_notice.c
index c0f7482a..70f933f6 100644
--- a/swad_notice.c
+++ b/swad_notice.c
@@ -32,6 +32,7 @@
 #include <stdlib.h>		// For free
 #include <string.h>
 
+#include "swad_alert.h"
 #include "swad_autolink.h"
 #include "swad_box.h"
 #include "swad_database.h"
diff --git a/swad_parameter.c b/swad_parameter.c
index 588b7e60..2c9158fe 100644
--- a/swad_parameter.c
+++ b/swad_parameter.c
@@ -38,6 +38,7 @@
 #include "swad_HTML.h"
 #include "swad_parameter.h"
 #include "swad_password.h"
+#include "swad_session.h"
 #include "swad_setting.h"
 #include "swad_tab.h"
 
diff --git a/swad_photo.c b/swad_photo.c
index df7cc27c..679a8153 100644
--- a/swad_photo.c
+++ b/swad_photo.c
@@ -36,6 +36,7 @@
 #include <unistd.h>		// For unlink
 
 #include "swad_action.h"
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_browser.h"
 #include "swad_config.h"
diff --git a/swad_photo_shape.c b/swad_photo_shape.c
index 0e9c5a44..0e6680f4 100644
--- a/swad_photo_shape.c
+++ b/swad_photo_shape.c
@@ -31,11 +31,13 @@
 #include <stdlib.h>		// For free
 
 #include "swad_action.h"
+#include "swad_box.h"
 #include "swad_config.h"
 #include "swad_error.h"
 #include "swad_figure.h"
 #include "swad_form.h"
 #include "swad_global.h"
+#include "swad_parameter.h"
 #include "swad_photo_shape.h"
 #include "swad_setting_database.h"
 #include "swad_user_database.h"
diff --git a/swad_place.c b/swad_place.c
index 7f48ce97..957b69e1 100644
--- a/swad_place.c
+++ b/swad_place.c
@@ -29,6 +29,7 @@
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_center_database.h"
 #include "swad_constant.h"
diff --git a/swad_plugin.c b/swad_plugin.c
index a45a9956..d55b2d60 100644
--- a/swad_plugin.c
+++ b/swad_plugin.c
@@ -61,7 +61,7 @@ extern struct Globals Gbl;
 /***************************** Private variables *****************************/
 /*****************************************************************************/
 
-static struct Plugin *Plg_EditingPlg = NULL;	// Static variable to keep the plugin being edited
+static struct Plg_Plugin *Plg_EditingPlg = NULL;	// Static variable to keep the plugin being edited
 
 /*****************************************************************************/
 /***************************** Private prototypes ****************************/
@@ -88,7 +88,7 @@ void Plg_ListPlugins (void)
    extern const char *Txt_Plugins;
    extern const char *Txt_Plugin;
    unsigned NumPlg;
-   struct Plugin *Plg;
+   struct Plg_Plugin *Plg;
    char URL[Cns_MAX_BYTES_WWW + Cns_BYTES_SESSION_ID + 1];
    char *Icon;
 
@@ -219,7 +219,7 @@ static void Plg_GetListPlugins (void)
    MYSQL_RES *mysql_res;
    MYSQL_ROW row;
    unsigned NumPlg;
-   struct Plugin *Plg;
+   struct Plg_Plugin *Plg;
 
    /***** Get plugins from database *****/
    if ((Gbl.Plugins.Num = Plg_DB_GetListPlugins (&mysql_res))) // Plugins found...
@@ -262,7 +262,7 @@ static void Plg_GetListPlugins (void)
 /*************************** Get data of a plugin ****************************/
 /*****************************************************************************/
 
-bool Plg_GetDataOfPluginByCod (struct Plugin *Plg)
+bool Plg_GetDataOfPluginByCod (struct Plg_Plugin *Plg)
   {
    MYSQL_RES *mysql_res;
    MYSQL_ROW row;
@@ -328,7 +328,7 @@ void Plg_FreeListPlugins (void)
 static void Plg_ListPluginsForEdition (void)
   {
    unsigned NumPlg;
-   struct Plugin *Plg;
+   struct Plg_Plugin *Plg;
    char *Icon;
 
    /***** Begin table *****/
diff --git a/swad_plugin.h b/swad_plugin.h
index 3858a053..02bd18da 100644
--- a/swad_plugin.h
+++ b/swad_plugin.h
@@ -43,7 +43,7 @@
 /******************************* Public types ********************************/
 /*****************************************************************************/
 
-struct Plugin
+struct Plg_Plugin
   {
    long PlgCod;
    char Name[Plg_MAX_BYTES_PLUGIN_NAME + 1];
@@ -60,7 +60,7 @@ struct Plugin
 
 void Plg_ListPlugins (void);
 void Plg_EditPlugins (void);
-bool Plg_GetDataOfPluginByCod (struct Plugin *Plg);
+bool Plg_GetDataOfPluginByCod (struct Plg_Plugin *Plg);
 void Plg_FreeListPlugins (void);
 long Plg_GetParamPlgCod (void);
 void Plg_RemovePlugin (void);
diff --git a/swad_plugin_database.c b/swad_plugin_database.c
index 7e6419bb..0fe55398 100644
--- a/swad_plugin_database.c
+++ b/swad_plugin_database.c
@@ -32,7 +32,7 @@
 /***************************** Create a new plugin ***************************/
 /*****************************************************************************/
 
-void Plg_DB_CreatePlugin (const struct Plugin *Plg)
+void Plg_DB_CreatePlugin (const struct Plg_Plugin *Plg)
   {
    DB_QueryINSERT ("can not create plugin",
 		   "INSERT INTO plg_plugins"
diff --git a/swad_plugin_database.h b/swad_plugin_database.h
index 3a0d1b5a..9be395b1 100644
--- a/swad_plugin_database.h
+++ b/swad_plugin_database.h
@@ -35,7 +35,7 @@
 /****************************** Public prototypes ****************************/
 /*****************************************************************************/
 
-void Plg_DB_CreatePlugin (const struct Plugin *Plg);
+void Plg_DB_CreatePlugin (const struct Plg_Plugin *Plg);
 void Plg_DB_ChangeName (long PlgCod,
                         const char NewPlgName[Plg_MAX_BYTES_PLUGIN_NAME + 1]);
 void Plg_DB_ChangeDescription (long PlgCod,
diff --git a/swad_privacy.c b/swad_privacy.c
index 41079e95..b7179e0f 100644
--- a/swad_privacy.c
+++ b/swad_privacy.c
@@ -31,6 +31,7 @@
 #include <string.h>
 
 #include "swad_action.h"
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_enrolment_database.h"
 #include "swad_error.h"
diff --git a/swad_program_resource.c b/swad_program_resource.c
index 92d7a073..c1ef9d71 100644
--- a/swad_program_resource.c
+++ b/swad_program_resource.c
@@ -30,8 +30,10 @@
 #include <stdlib.h>		// For free
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
 #include "swad_assignment_resource.h"
 #include "swad_attendance_resource.h"
+#include "swad_box.h"
 #include "swad_browser_resource.h"
 #include "swad_call_for_exam_resource.h"
 #include "swad_error.h"
@@ -40,6 +42,7 @@
 #include "swad_forum_resource.h"
 #include "swad_game_resource.h"
 #include "swad_global.h"
+#include "swad_parameter.h"
 #include "swad_program.h"
 #include "swad_program_database.h"
 #include "swad_program_resource.h"
diff --git a/swad_question.c b/swad_question.c
index b88e7258..04c7daed 100644
--- a/swad_question.c
+++ b/swad_question.c
@@ -30,12 +30,15 @@
 #include <stdlib.h>		// For free
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
+#include "swad_box.h"
 #include "swad_database.h"
 #include "swad_error.h"
 #include "swad_exam_set.h"
 #include "swad_figure.h"
 #include "swad_form.h"
 #include "swad_global.h"
+#include "swad_parameter.h"
 #include "swad_question.h"
 #include "swad_question_database.h"
 #include "swad_question_import.h"
diff --git a/swad_question_database.c b/swad_question_database.c
index 83cde090..973aab25 100644
--- a/swad_question_database.c
+++ b/swad_question_database.c
@@ -27,9 +27,11 @@
 
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
 #include "swad_database.h"
 #include "swad_error.h"
 #include "swad_global.h"
+#include "swad_parameter.h"
 #include "swad_question.h"
 #include "swad_test_print.h"
 
diff --git a/swad_question_import.c b/swad_question_import.c
index b008ee53..1d87f9aa 100644
--- a/swad_question_import.c
+++ b/swad_question_import.c
@@ -30,6 +30,7 @@
 #include <sys/stat.h>		// For mkdir
 #include <sys/types.h>		// For mkdir
 
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_database.h"
 #include "swad_error.h"
diff --git a/swad_record.c b/swad_record.c
index 1270e0a0..8d02af6b 100644
--- a/swad_record.c
+++ b/swad_record.c
@@ -35,6 +35,7 @@
 #include "swad_account.h"
 #include "swad_account_database.h"
 #include "swad_action.h"
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_config.h"
 #include "swad_database.h"
diff --git a/swad_room.c b/swad_room.c
index 6a8f9457..a7cec685 100644
--- a/swad_room.c
+++ b/swad_room.c
@@ -29,6 +29,7 @@
 #include <stddef.h>		// For NULL
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_building.h"
 #include "swad_database.h"
@@ -38,6 +39,7 @@
 #include "swad_group_database.h"
 #include "swad_HTML.h"
 #include "swad_MAC.h"
+#include "swad_parameter.h"
 #include "swad_room.h"
 #include "swad_room_database.h"
 
diff --git a/swad_statistic.c b/swad_statistic.c
index c77967a2..d54e2550 100644
--- a/swad_statistic.c
+++ b/swad_statistic.c
@@ -31,6 +31,7 @@
 #include <stdlib.h>		// For getenv, malloc
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
 #include "swad_banner.h"
 #include "swad_box.h"
 #include "swad_database.h"
@@ -43,6 +44,8 @@
 #include "swad_ID.h"
 #include "swad_log.h"
 #include "swad_log_database.h"
+#include "swad_parameter.h"
+#include "swad_plugin.h"
 #include "swad_profile.h"
 #include "swad_role.h"
 #include "swad_statistic.h"
@@ -2729,7 +2732,7 @@ static void Sta_ShowNumHitsPerPlugin (Sta_CountType_t CountType,
    unsigned NumHit;
    struct Sta_Hits Hits;
    MYSQL_ROW row;
-   struct Plugin Plg;
+   struct Plg_Plugin Plg;
 
    /***** Write heading *****/
    HTM_TR_Begin (NULL);
diff --git a/swad_string.c b/swad_string.c
index 8c9a2067..d4224188 100644
--- a/swad_string.c
+++ b/swad_string.c
@@ -33,9 +33,11 @@
 #include <stdlib.h>		// For free
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
 #include "swad_error.h"
 #include "swad_global.h"
 #include "swad_notification_database.h"
+#include "swad_parameter.h"
 #include "swad_string.h"
 
 /*****************************************************************************/
diff --git a/swad_tag.c b/swad_tag.c
index 5bc6d130..be3b80b8 100644
--- a/swad_tag.c
+++ b/swad_tag.c
@@ -33,10 +33,13 @@
 #include <string.h>		// For string functions
 
 #include "swad_action.h"
+#include "swad_alert.h"
+#include "swad_box.h"
 #include "swad_database.h"
 #include "swad_error.h"
 #include "swad_form.h"
 #include "swad_global.h"
+#include "swad_parameter.h"
 #include "swad_tag.h"
 #include "swad_tag_database.h"
 #include "swad_theme.h"
diff --git a/swad_test.c b/swad_test.c
index 79637e4c..487dda8d 100644
--- a/swad_test.c
+++ b/swad_test.c
@@ -38,6 +38,7 @@
 #include <sys/types.h>		// For mkdir
 
 #include "swad_action.h"
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_database.h"
 #include "swad_error.h"
diff --git a/swad_test_print.c b/swad_test_print.c
index bea2bbde..2129b8eb 100644
--- a/swad_test_print.c
+++ b/swad_test_print.c
@@ -34,12 +34,15 @@
 #include <string.h>		// For string functions
 
 #include "swad_action.h"
+#include "swad_alert.h"
+#include "swad_box.h"
 #include "swad_database.h"
 #include "swad_error.h"
 #include "swad_form.h"
 #include "swad_global.h"
 #include "swad_HTML.h"
 #include "swad_ID.h"
+#include "swad_parameter.h"
 #include "swad_photo.h"
 #include "swad_question.h"
 #include "swad_question_database.h"
diff --git a/swad_timeline.c b/swad_timeline.c
index 90309d44..ce6c26ff 100644
--- a/swad_timeline.c
+++ b/swad_timeline.c
@@ -128,6 +128,7 @@ mysql> SHOW TABLES LIKE 'tml_%';
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For free
 
+#include "swad_box.h"
 #include "swad_error.h"
 #include "swad_figure.h"
 #include "swad_global.h"
diff --git a/swad_timeline_comment.c b/swad_timeline_comment.c
index 1f958f52..c5fabd41 100644
--- a/swad_timeline_comment.c
+++ b/swad_timeline_comment.c
@@ -30,11 +30,13 @@
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For free
 
+#include "swad_box.h"
 #include "swad_error.h"
 #include "swad_forum.h"
 #include "swad_global.h"
 #include "swad_message.h"
 #include "swad_notification_database.h"
+#include "swad_parameter.h"
 #include "swad_photo.h"
 #include "swad_profile.h"
 #include "swad_timeline.h"
diff --git a/swad_timeline_form.c b/swad_timeline_form.c
index 4ee9cb5b..396aae3b 100644
--- a/swad_timeline_form.c
+++ b/swad_timeline_form.c
@@ -30,6 +30,7 @@
 #include <stdlib.h>		// For free
 
 #include "swad_action.h"
+#include "swad_alert.h"
 #include "swad_error.h"
 #include "swad_global.h"
 #include "swad_timeline.h"
diff --git a/swad_timeline_note.c b/swad_timeline_note.c
index edec755a..80bb4671 100644
--- a/swad_timeline_note.c
+++ b/swad_timeline_note.c
@@ -41,6 +41,7 @@
 #include "swad_hierarchy.h"
 #include "swad_notice.h"
 #include "swad_notification_database.h"
+#include "swad_parameter.h"
 #include "swad_photo.h"
 #include "swad_profile.h"
 #include "swad_timeline.h"
diff --git a/swad_timeline_post.c b/swad_timeline_post.c
index d2a6c037..3b3f6490 100644
--- a/swad_timeline_post.c
+++ b/swad_timeline_post.c
@@ -29,12 +29,14 @@
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For free
 
+#include "swad_alert.h"
 #include "swad_database.h"
 #include "swad_error.h"
 #include "swad_global.h"
 #include "swad_info.h"
 #include "swad_media.h"
 #include "swad_message.h"
+#include "swad_parameter.h"
 #include "swad_profile.h"
 #include "swad_timeline.h"
 #include "swad_timeline_database.h"
diff --git a/swad_timeline_publication.c b/swad_timeline_publication.c
index 84015804..7c7e8a0e 100644
--- a/swad_timeline_publication.c
+++ b/swad_timeline_publication.c
@@ -32,6 +32,7 @@
 #include "swad_follow.h"
 #include "swad_follow_database.h"
 #include "swad_global.h"
+#include "swad_parameter.h"
 #include "swad_profile.h"
 #include "swad_profile_database.h"
 #include "swad_timeline.h"
diff --git a/swad_timeline_user.c b/swad_timeline_user.c
index 22487c7b..96fd4a06 100644
--- a/swad_timeline_user.c
+++ b/swad_timeline_user.c
@@ -31,6 +31,7 @@
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For free
 
+#include "swad_alert.h"
 #include "swad_error.h"
 #include "swad_global.h"
 #include "swad_photo.h"
diff --git a/swad_timeline_who.c b/swad_timeline_who.c
index 0e709983..7deaffd7 100644
--- a/swad_timeline_who.c
+++ b/swad_timeline_who.c
@@ -25,6 +25,7 @@
 /*********************************** Headers *********************************/
 /*****************************************************************************/
 
+#include "swad_alert.h"
 #include "swad_database.h"
 #include "swad_follow.h"
 #include "swad_global.h"
diff --git a/swad_timetable.c b/swad_timetable.c
index 4455b63e..b023df7f 100644
--- a/swad_timetable.c
+++ b/swad_timetable.c
@@ -31,6 +31,7 @@
 #include <stdlib.h>		// For malloc, calloc, free
 #include <string.h>		// For string functions
 
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_calendar.h"
 #include "swad_database.h"
diff --git a/swad_user.c b/swad_user.c
index 175dbf29..8eb2d366 100644
--- a/swad_user.c
+++ b/swad_user.c
@@ -83,6 +83,7 @@
 #include "swad_record.h"
 #include "swad_record_database.h"
 #include "swad_role.h"
+#include "swad_session.h"
 #include "swad_session_database.h"
 #include "swad_setting.h"
 #include "swad_tab.h"
diff --git a/swad_zip.c b/swad_zip.c
index a9dd2a60..0f110ff4 100644
--- a/swad_zip.c
+++ b/swad_zip.c
@@ -36,6 +36,7 @@
 #include <sys/types.h>		// For mkdir...
 #include <unistd.h>		// For chdir...
 
+#include "swad_alert.h"
 #include "swad_box.h"
 #include "swad_browser.h"
 #include "swad_browser_database.h"