Source: http://www.oreillynet.com/mac/blog/2002/06/p3p_in_ie6_frustrating_failure.html
“MSIE 6 has an inaccurate definition of third party cookies. If your domain is hosted on one server and your PHP stuff is on another, the IE6 P3P implementation considers any cookies sent from the second machine “third party”. Third party cookies will be blocked automatically in most privacy settings if not accompanied by what MS considers “an appropriate Compact Policy”. In order to make this new piece of tweakable garbage happy I’d suggest you’d par exemple send
header(’P3P: CP=”NOI ADM DEV PSAi COM NAV OUR OTRo STP IND DEM”‘);
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