From this answer: fooobar.com/questions/939855 / ...
I think you are mistaken about the Support Party and the OpenID provider. Using StackOverflow as an example, SO is a third-party, and other sites (such as Google) are the OpenID providers (s).
A third-party (such as SO) does not have the right to say when an OpenID provider (such as Google) prefers to βforgetβ the user for their own purposes.
DotNetOpenId does not offer this function because OpenID itself does not have this function in its specification.
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