Hi,
The special pages are used by the system for pages that are returned in specific cases. In this instance the "not found" page that you have, is returned if a user types in the URL of your site but does not correctly type in the address of one of your pages.
Under normal conditions there is no need for the user to create or edit the special pages. However, if you'd like your users to see a specific piece of content when they enter a URL incorrectly you can modify this page.
Regards,
Rob Denison.
Cambridge Open Systems' support team