Determining unread items in a forum

Question

Using PHP and MySQL, I have a forum system I\'m trying to build. What I want to know is, how can I set it so that when a user reads a forum entry, it shows as read JUST for

Answer 1

The used of functionality user’s browser and add the last post ID in the link of the thread. After use of a: visited in CSS you can display all thread that did not read by user.