a link to http://logout:logout@<?=$_SERVER['HTTP_HOST'];?>/SECRET/ would force a fresh login for the /SECRET directory if no user logout with password logout exists.
[NOTE BY danbrown AT php DOT net: The following note was added by "Anonymous" on 01-APR-2010 (though we presume it's not an April Fool's Day joke).]
this logout method does not work 100% anymore, because of another bulls**t from M$:
http://support.microsoft.com/kb/834489