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Here are two articles from Microsoft:
Pragma Tag May Not Prevent Page From Being Cached [support.microsoft.com]
How To Prevent Caching In Internet Explorer [support.microsoft.com]
I've been confounded looking for Netscape documentation. I have found some sites that claim the pragma meta WILL stop image caching, and they claim a 15% increase in banner ad impressions by using it. They say that the tag means a new impression, even on Back button page views. They also caution that invalid cache control tags can stop a page from being displayed at all.
you've given nothing but good solid info on the forum, and I'm inclined to believe you on this issue. Do you have reference handy on the pragma tag and image caching?
But that only describes how things work when the client and proxies do what they're supposed to. I haven't noticed any doing the wrong thing with regard to images, but I wouldn't be surprised if they got it wrong under some circumstances. NS6 and Mozilla don't cache POST data and MSIE has the quirks mentioned in those MS support articles mentioned above, so one more caching bug wouldn't knock me out of my chair ;)