Techniques for detecting online users

hello guys, can anyone give me a nice way to know whether a user is online or not ?? another question, is there anyway to iterate threw all the session scopes for all the sessions ?? thanks in advanced and merry christmas to all :) Saidi.

Take a look at HttpSessionListener
http://one-size-doesnt-fit-all.blogspot.com/2008/08/jdevadf-how-to-log-user.html
Everything of course is approximate...
sessionCreated/sessionDestroyed what i would use

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