See here for more details. Different users have access to different functions of the site. While anyone can do most things on the site, including reading and editing, administrators can access a few additional functions: * Deleting and undeleting pages, page histories, and uploaded files. * Locking (protecting) a page so it cannot be edited or renamed by users without admin rights. * Blocking IP addresses or user names from editing; and very quick "rollback" of undesirable edits. * Editing the interface by changing system messages and skins.