| drupal_render | includes/common.inc | Renders HTML given a structured array tree. |
| drupal_set_content | includes/common.inc | Set content for a specified region. |
| element_children | includes/common.inc | Get keys of a structured array tree element that are not properties (i.e., do not begin with '#'). |
| module_exists | includes/module.inc | Determine whether a given module exists. |
| system_region_list | modules/system/system.module | Get a list of available regions from a specified theme. |
| t | includes/common.inc | Translate strings to the page language or a given language. |
| template_preprocess_block_admin_display_form | modules/block/block.admin.inc | Process variables for block-admin-display.tpl.php. |
