When you view the Forum list and the thread list within each forum there are symbols at the far left that tell you if there are new unread messages. The description of the symbols is at the bottom of the page.
After you do a "Mark This Forum Read" all those symbols change to "No new posts".
If you want to see the new posts since your last visit don't forget the "New Posts" link in the blue nav bar at the top of the Forum.
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