| check_plain | includes/bootstrap.inc | Encode special characters in a plain-text string for display as HTML. |
| drupal_add_link | includes/common.inc | Add a <link> tag to the page's HEAD. |
| drupal_set_title | includes/bootstrap.inc | Set the title of the current page, for display on the page and in the title bar. |
| l | includes/common.inc | Format an internal Drupal link. |
| menu_set_location | includes/menu.inc | Change the current menu location of the user. |
| module_exist | includes/module.inc | Determine whether a given module exists. |
| t | includes/common.inc | Translate strings to the current locale. |
| taxonomy_get_vocabulary | modules/taxonomy.module | Return the vocabulary object matching a vocabulary ID. |
| theme | includes/theme.inc | Generate the themed representation of a Drupal object. |
| theme_forum_display | modules/forum.module | Format the forum body. |
| url | includes/common.inc | Generate an internal Drupal URL. |
| user_access | modules/user.module | Determine whether the user has a given privilege. |
| variable_get | includes/bootstrap.inc | Return a persistent variable. |
