This is how you can apply changes to a link in the primary_links section, for instance if you want to append a badge with a number of items for that specific view.
The code can be applied in the template.php of your theme.
This is how you can create a custom menu programmatically
This is just some notes, you wont get anything out of it :-)
In order to rebuild the menu in Drupal 6 you have to go to admin/build/modules, but you don't have to submit it.
In Drupal 5 you just need to empty the cache table by TRUNCATE cache_menu;
Send an argument to page from a menu item
<?php
$items['admin/content/node'] = array(
'title' => 'Content',
'description' => "View, edit, and delete your site's content.",
'page callback' => 'drupal_get_form',
'page arguments' => array('node_admin_content'),
'access arguments' => array('administer nodes'),
'file' => 'node.admin.inc',
);
?>