This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Probably a beginners question this one, but I'm not sure about the answer even after reading the the mails about it in this forum.
When we are using HTTP-sessions is a servlet application, it is most of the time doen by using cookies, or by URL-rewriting.