note 15152 deleted from function.header by jimw

To summarize the caching info scattered throughout the comments, it appears that the line: header ("Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0"); is the trick you want to stop caching by various browsers and proxy servers. Take particular note of the no-store element, which is necessary to stop AOL's proxy servers from caching (and stop zillions of confused AOLers from emailing you). Also note that headers work like variables--if you define 2 Cache Control statements, the second one overwrites the first one instead of adding it as an additional parameter (this wasn't initially clear to me).