When a page is requested by a browser, the only information you get is what the browser sends. This includes the URL, any parameters on the end of the URL, and any headers sent with the request, such as cookies or post data. The only why to get the session id that corresponds to that visitor is if the browser sends it to you.
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Error checking, error reporting, and error recovery. If your code does not have these to get it to tell you why it is not working, what makes you think someone in a programming forum will be able to tell you why it is not working???
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