how to expire a page?

From: Date: Fri, 16 Jul 2004 14:33:44 +0000
Subject: how to expire a page?
Groups: php.windows 
Request: Send a blank email to php-windows+get-24189@lists.php.net to get a copy of this message
I want that if the user press the back button of the browser, the page expires. How can I do that?. Thx in advance. Alex

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