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HTML does not provide session handling. If you are using PHP for sessions though, you could simply check whether a session exists before the page is built up and return an error if there is already one. Of course you will have to watch out with that, because it's possible that the session hasn't been closed when the user left the page, i.e. it might happen that a user is opening the page for the first time but already has an existing session anyway.

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Q: What is the HTML for not letting someone access the same page twice in the same session?
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