PHP Warning: Use of undefined constant VBA_SCRIPT - assumed 'VBA_SCRIPT' (this will throw an Error in a future version of PHP) in ..../includes/functions_navigation.php(802) : eval()'d code on line 1 Marked as read
The "Marked as read" simply allows you to mark all posts in a acategory as read. In other words they will no longer have the NEW graphic in front of them. They will only have teh new graphic in front of them once someone posts a reply to an existing topic or if it is a new topic that has been posted.
Just helps you keep a track of what you have read and what is new