comment_controls_submit in modules/comment/comment.module
Process comment_controls form submissions.
install_configure_form_submit in ./install.php
Form API submit for the site configuration form.
system_admin_compact_page in modules/system/system.admin.inc
Menu callback; Sets whether the admin menu is in compact mode or not.
user_edit_submit in modules/user/user.pages.inc
user_profile_form_submit in modules/user/user.pages.inc
Submit function for the user account and profile editing form.
user_register_submit in modules/user/user.module
Submit handler for the user registration form.
user_user_operations_block in modules/user/user.module
Callback function for admin mass blocking users.
user_user_operations_unblock in modules/user/user.module
Callback function for admin mass unblocking users.