If I do understand you right, you are not meaning that you want a session cookie to die when the browser is closed, but rather something serverside to happen, is that correct?

Well, if you do know that you can rely on the user having javascript in their browsers, you could do something onClose(), probably calling some url with a query-string that contains an unique ID and tells the server to close or invalidate this license. You can do this via window.open(), document.href=xxx or my personal favourite: var call = new Image(); call.src = url_to_call; which will call any url really sneaky. Heh.

Far as I know, this (and similar techniques) are the only way to invoke something remotely upon a close of the browser. Or I didn't understand the question, after all?

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