I would think that you wouldn't need to track the notion of a session but have 
something where the selector that tracked where the card was previously sent in 
terms of a list would allow you to graphically send another event. You could 
optionally walk a list based on each card.

-----Original Message-----
From: Johannes Ernst [mailto:[EMAIL PROTECTED]
Sent: Friday, April 06, 2007 12:29 PM
To: McGovern, James F (HTSC, IT)
Cc: specs@openid.net
Subject: Re: Logout


So far, neither OpenID nor CardSpace define the notion of a session, so no 
common logout is possible within the standard protocols. 


What we do in our code at NetMesh is to add a convention where
    RP-URL?lid=OPENID
is the same thing as "submitted OpenID URL in the first form", to which the 
RP-URL responds with a redirect to the OP, while
    RP-URL?lid=
means "become anonymous again" aka "logout".


There are substantial usability issues with common logout in a decentralized, 
"internet-scale" approach, however, that nobody has really solved as far as I 
know.
 



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