| drupal_access_denied | drupal/includes/common.inc | Generates a 403 error if the request is not allowed. |
| drupal_not_found | drupal/includes/common.inc | Generates a 404 error if the request can not be handled. |
| file_create_path | drupal/includes/file.inc | Make sure the destination is a complete path and resides in the file system
directory, if it is not prepend the file system directory. |
| file_transfer | drupal/includes/file.inc | Transfer file using HTTP to client. Pipes a file through Drupal to the
client. |
| module_invoke_all | drupal/includes/module.inc | Invoke a hook in all enabled modules that implement it. |
