Why the data in HTML form lost when the user press back button?

From: Date: Fri, 23 Mar 2001 10:20:48 +0000
Subject: Why the data in HTML form lost when the user press back button?
Groups: php.general 
Request: Send a blank email to php-general+get-45262@lists.php.net to get a copy of this message
Why the data in HTML form lost when the user press back button? And I find that this problem only exist if I use session_start() to enable session variable. But I can't disable it because the user information in session useful in every pages

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