In the url? Some browsers have issues keeping the session live or enabled when browsing web pages. PHPBB is a good example, because some times IE doesn't like to keep the session enabled, yet that little trick helps just that. http://www.google.com/search?hl=en&q=session+id+in+url&aq=f&oq= There are some cons with this method: http://stackoverflow.com/questions/139238/session-id-in-url-and-or-cookie