VaultWiki includes a number of articles called Special pages. These pages are contained in the Special namespace, and they provide statistical information about your wiki.
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Some Special pages are hidden, but you can view a near complete list by visiting your wiki's Special:Specialpages page.
Special pages do not contain "content", so they are not saved using vBulletin's threads or posts. They cannot be edited. If you wish to modify the wording of a special page, you can search for the phrase in your AdminCP. Go to Languages & Phrases > Search in Phrases.
A user's permission to view any particular Special Page is based on your forum's Usergroup Permissions.