What to use when HTTP_REFERER is not set?

From: Date: Sat, 03 Nov 2001 20:58:58 +0000
Subject: What to use when HTTP_REFERER is not set?
Groups: php.general 
Request: Send a blank email to php-general+get-73358@lists.php.net to get a copy of this message
Hello, I need to put a small security feature in one of my page. The page is open as a popup from another web site. By checking the referer I tought I could block any other call to this page but the referer variable is often not set... What else could I do? ( no ssl so far is available for this :( ) Any advice, tutorial or doc on the subject would be helpful. thanks, py

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