Logs the user on by outputting the appropriate headers to either a 302 redirect URL or the initiation of a Passport-aware client authentication exchange. This class is deprecated.
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A string representing the Passport Login Challenge.
This class has been deprecated and is no longer supported. Microsoft Passport Network has been replaced by Windows Live ID. For more information about how to use Windows Live ID to authenticate users in a Web application, see tp://go.microsoft.com/fwlink/?LinkId=106346.