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Page History is the list of changes made to any given page on a wiki which can be accessed through the "View history" tab in the upper right hand corner of any page (just to the left of the search box). A newly created page will have only a single entry listing the date and time it was created, the username or IP address of the person who created it, the size in bytes and a brief summary of the contents. Any further additions or changes made to the page and saved will appear as separate entries.
Once there are two or more entries in the page history, the various versions of the page can be compared to see what exactly has changed.