drupal/modules/admin.module

<?php
// $Id$

/**
 * Implementation of hook_help().
 */
function admin_help($section) {
  switch ($section) {
    case 'admin/modules#description':
      return t('Handles the administration pages.');
    case 'admin':
      return t('Welcome to the administration section. Below are the most recent system events.');
  }
}

/**
 * Implementation of hook_menu().
 */
function admin_menu() {
  $items = array();
  $items[] = array('path' => 'admin', 'title' => t('administer'),
    'access' => user_access('access administration pages'),
    'callback' => 'admin_main_page',
    'weight' => 9);
  return $items;
}

/**
 * Menu callback; provides the main page of the administration section.
 */
function admin_main_page() {
  watchdog_overview('actions');
}

?>