Internet Explorer Caching

[Charlene <cwemagazines@xxxxxxxxxxx>]

I've been having problems with Internet Explorer caching php programs.  
I'm using the following code:

       header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
       header("Pragma", "no-cache");
       header("Expires", "-1");

And it used to work, but now, according to Windows Explorer its giving 
it 3 hours to expire.

Charlene

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