I dont know how the Monastry is doing this, but if I had to implement it I would keep a last-activity timestamp in my database for all user sessions, and if a session has seen activity (i.e.: loaded a page from my site) in the last, say, 5 minutes, I would declare this a "currently online visitor".

In reply to Re: current online visitors list by Thilosophy
in thread current online visitors list by opensourcer

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