| drupal_access_denied | includes/common.inc | Generates a 403 error if the request is not allowed. |
| drupal_get_normal_path | includes/path.inc | Given a path alias, return the internal path it represents. |
| drupal_init_path | includes/path.inc | Initialize the $_GET['q'] variable to the proper normal path. |
| drupal_is_front_page | includes/path.inc | Check if the current page is the front page. |
| drupal_not_found | includes/common.inc | Generates a 404 error if the request can not be handled. |
| menu_edit_item_validate | modules/menu/menu.admin.inc | Validate form values for a menu link being added or edited. |
| search_index | modules/search/search.module | Update the full-text search index for a particular item. |
| system_site_information_settings_validate | modules/system/system.admin.inc | Validate the submitted site-information form. |
| system_update_6021 | modules/system/system.install | Migrate the menu items from the old menu system to the new menu_links table. |
| _menu_site_is_offline | includes/menu.inc | Checks whether the site is off-line for maintenance. |