For the "Siamese HTML Document" -- that one rings a bell... I swear there was a bug in one of the ancient horrible versions of IE that required you to include y

For the "Siamese HTML Document" -- that one rings a bell... I swear there was a bug in one of the ancient horrible versions of IE that required you to include your "no cache" tags AGAIN in a second head tag, if you wanted to use http-equiv tags instead of real HTTP headers. I'm pretty sure there hasn't been reason for anyone to do that for a decade or so, though.