Yes, using the HostContainer object.
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Here's a demo page: http://www.windjack.com/WindJack/Browser2PDF/brwsr2acroJS.htm
Thanks George for that warning. I was going to post this link as well:
but given the difficulties, I'm going to try my second line of attack, which is to have the outer html page call a web service to get its info before either closing or prompting the user if they really want to move off the page. This is all happening in the web page in the onbeforeunload handler.