10 uses of MAINTENANCE_MODE

ajax_footer in drupal/includes/ajax.inc
Performs end-of-Ajax-request tasks.
drupal_aggregate_css in drupal/includes/common.inc
Default callback to aggregate CSS files and inline content.
drupal_exit in drupal/includes/common.inc
Performs end-of-request tasks.
drupal_get_js in drupal/includes/common.inc
Returns a themed presentation of all JavaScript code for the current page.
drupal_installation_attempted in drupal/includes/bootstrap.inc
Returns TRUE if a Drupal installation is currently being attempted.
error_displayable in drupal/includes/errors.inc
Determines whether an error should be displayed.
menu_get_custom_theme in drupal/includes/menu.inc
Gets the custom theme for the current page, if there is one.
update_flush_caches in drupal/modules/update/update.module
Implements hook_flush_caches().
_drupal_bootstrap_full in drupal/includes/common.inc
_drupal_maintenance_theme in drupal/includes/theme.maintenance.inc
Sets up the theming system for maintenance page.