how to reset the windows authentication

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I made an intranet website by php, webserver IIS on windows 2000.
To manage users I used the windows authentication.
Now I have to create logout.php that has to destroy sessions and windows
authentication too,
to allow the login to another user from the same pc (for example).
I can destroy sessions variables by:
$_SESSION = array();

but how can I destroy or reset the windows authentication?
My problem is that I'm not able to display the window with user name,
and domain to change the window user. :-(

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