The Page Change Monitor subscription (for the Protected User Area) cannot monitor pages that are password protected. So, this page will be updated, which is outside the Admin Area (not protected), whenever the Existing User Admin Area changes. I will simply prepend the date and changes to the list below, so if you subscribe to the Page Change Monitor (WatchThatPage) service (which is Free), it will let you know on which date the Admin Area was updated.
From here, you can return to either:
Changes Made (however, there are possibly others too...)