Shared Authentication Schemes Which Are Not Single Sign-on
Single sign-on requires that users literally sign in once to establish their credentials. Systems which require the user to log in multiple times to the same identity are inherently not single sign-on. For example, an environment where users are prompted to log in to their desktop, then log in to their email using the same credentials, is not single sign-on.
Read more about this topic: Single Sign-on
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