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Your book was a Great Find, thanks to your hard work, I am making great progress as well now... My question is probably a simple one but here goes: Are sessions relative to the server time connected? By that I mean, are they separated from all other users that may be using my website at the same time? Or do they overlap with all users and therefore do I have to establish an unique session set for each person who signs in to the site. I am hoping that the first choice is right (easier) and all I have to do is start every web page with: <?PHP ob_start(); isset($_SESSION) || session_start(); ... and the server assigns each user a unique id to keep all other sessions apart? In the session_start() am I supposed to put something in-between the () such as my own set-name, or is that always empty? Does it allow for a parameter and if so what goes there? Thanks in advance for any words of wisdom!!!