Is it correct to assume that a session in Links SQL is started upon loading a specific page then ends at 3 hours or whatever your setting is? And is it correct that if a person leaves the site and then comes right back (browser back) a second session is created?

I think the session for a user is kept for three hours (or whatever you want it to). If a person leaves a site and comes back, the same session should be used (at least if you use cookies, with urls it might be different).

Your question in some other post: sessions should be cleaned up whenever a user logs in (i.e. all old sessions are deleted). Therefore only the users logged in in the last three hours will be seen in the session directory.

Ivan
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Iyengar Yoga Resources / GT Plugins