You know I don't do code, but to me the logical place to start would be
the code behind "login as a different user." If that could be modified
somehow so that it really logged out a user  before logging in a new one,
that might suffice. You could also educate the users  to "login as a
different user" using a bogus account  or an account that has no access
to anything. That would give  them a denied page and the opportunity to
login as another user.

Just trying to think of a solution that requires a lot of coding.

It was nice to finally put a face to the name, it was my pleasure to you.

I had a few friends looking for solutions, and the solution that I have
partially working right now involves this piece of javascript:

function Logout()
{
try {
if (browseris.ie6up)
{ document.execCommand("ClearAuthenticationCache", "false");
window.location.href = http://wherever you want to redirect  the user;

}
else
{
alert("This feature requires Internet Explorer 6.0 Service Pack 1 or
above. " + "Please close all browser windows  in order to complete the logout
process.");
}
}
catch (e)
{ alert("This feature requires Internet Explorer 6.0 Service Pack 1 or
above. " + "Please close all browser  windows in order to complete the logout
process."); }
}

There are a few steps involved in making all this happen, and I will post a
complete solution when it is completed (hopefully by tomorrow) for
everyone's benefit.

This is on the assumption that the ASP.net session is being held using
the cookies.....

You might want to look at the browser  cookies created when a user  logs
into the Sps2003 site (a browser like mozilla will help you to recognize
the cookies getting created.). Then, on logoff, try deleting these
cookies. This might clear  the session.

Following command can be used to clear  credentials

document.execCommand("ClearAuthenticationCache","false");