Ok, so too much idle time for thinking, but how does this work? Say you click on "New Posts" and get the list up to date at that moment. You scroll through the list and maybe read one thread. You click the back button and return to the list of new posts which is now 3 minutes old. Unbeknownst to you there have been 2 new posts in 2 threads in those 3 minutes. You now click the "Mark Forums Read" button. Does it just mark everything from your 3 minutes old list as read or does it also mark the 2 new posts you don't know about as well?