It's possible but difficult.  You'll need to use Browser Helper Objects -
and it will only work in IE.  Here is a reference to the basics on BHOs...

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnwebgen/ht
ml/bho.asp

another reference - 
http://msdn.microsoft.com/library/default.asp?url=/nhp/Default.asp?contentid
=28000441



-----Original Message-----
From: Imar Spaanjaars [mailto:Imar@S...]
Sent: Wednesday, November 13, 2002 10:33 AM
To: ASPX_Professional
Subject: [aspx_professional] Re: get url


Playing Big Brother???


AFAIK, and HOPE, this is not possible. This would mean you could see I 
visit playboy.com right after I visited your site ;-)


Imar


At 11:28 AM 11/13/2002 -0500, you wrote:
>Hi all, someone knows how to get the url a user is trying to navigate
>inside the unload event in a page.
>
>Thanks for any help
>
>