[OpenID] do i need to add a "sign out completely" function for my users?

[Jen Williams]

Our site currently uses windows live for authentication which means that
when a user signs out it only signs them out of our website - I then provide
another button if they wish to sign out completely of windows live. I'm
adding support to login using OpenID as well - do I need to provide a
similar function? Or is the OpenID only ever authenticating the user for our
website and therefore they don't need to do anything else after logging
out....
Thanks! (and sorry for the newbiness of the question!)

Jen
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