menu_list_system_menus

Return an array containing the names of system-defined (default) menus.

menu_delete_menu_confirm_submit in modules/menu/menu.admin.inc: Delete a custom menu and all items in it.
menu_delete_menu_page in modules/menu/menu.admin.inc: Menu callback; check access and get a confirm form for deletion of a custom menu.
menu_edit_menu in modules/menu/menu.admin.inc: Menu callback; Build the form that handles the adding/editing of a custom menu.
menu_get_menus in modules/menu/menu.module: Return an associative array of the custom menus names.

includes/menu.inc, line 1224

<?php
function menu_list_system_menus() {
  return array('navigation', 'primary-links', 'secondary-links');
}
?>

Search Drupal 6