The article is very useful. In my web app I have the browser client poll every minute for notification messages (via AJAX). As a result the users' session never expires and so I can't simply query my server side session to find out if the session is about the expire. I am using JSP/Servlets on the server side. I would almost like the polling client to be a separate session and not interfere with the "main" user session. Any ideas on how I can resolve this?