Compare selected versions
By clicking on the History tab you can Compare selected versions of a wiki page. The radio buttons allow you to select the date and time of the edit versions that you would like to compare.
The History tab is located on every page just under the search bar, between the Edit and Protect tabs.
The ability to Compare selected versions is helpful in that it allows you to see who has been making edits to a particular wikipage; one user of several, good or bad actors, when edits were made and any notes included in the edit summary.
