| add_menu_page() | Add a top-level menu page to the Dashboard (next to Posts, Pages, Users etc). |
| add_meta_box() | Adds a meta box to one or more screens. |
| add_options_page() | Add submenu page to the Settings main menu. |
| add_submenu_page() | Add a submenu page. This function takes a capability which will be used to determine whether or not a page is included in the menu. |
| add_theme_page() | Add submenu page to the Appearance main menu. |
| do_meta_boxes() | Meta-Box template function |
| get_admin_url() | Retrieves the URL to the site admin area. |
| get_current_screen() | Get the current screen object |
| includes_url() | Retrieves the URL to the wp-includes directory with the appropriate protocol: 'https' or 'http'. |
| is_admin() | Whether the current request is for an administrative interface page. |
| remove_menu_page() | Remove a top-level admin menu item, ex: "Posts", "Media", "Pages". |
| remove_meta_box() | Removes a meta box from one or more screens. |
| remove_submenu_page() | Remove an admin submenu. |
| wp_add_dashboard_widget() | Adds (register) a new widget (a meta box) to the administration dashboard (the main page of the admin panel). |
| wp_maintenance() | Die with a maintenance message when conditions are met. |