Eric's weblog - Ajax: Session Warning to Developers: "Ajax: Session Warning to Developers
One thing that you have to think about when developing an Ajax application is the user's session. Now there are two ways it can bite you in the butt. With first hand experience, I have seen these in other people’s applications and mine. Why it is a warning? They can cause some major problems if we do not account for them. Problem 1 can lead to security issues with a long lunch break and Problem 2 can just leave a user hanging wondering why the clicking the button 20 times did nothing!"