How can i invalidate Session when a browser crashes?

Hi
How can i invalidate session when a browser window closed or crashed unexpectedly.
If user closed the browser window using File->Close, then i'm calling javascript function .... and it is working fine. But when browser window is hanged and closed using ENDTASK, how can i kill that session.
Please help
Thanks
-Vidyadhar

Well you can't. Execution halts, so anything you would want to do is made impossible: that's why crashes are the #1 enemy of any software developer (that and impossible deadlines). The webserver will remove the session manually when it times out though.

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