Passport authenticationPassport authentication provides authentication using Microsoft’s passport service.
If passport authentication is configured and users login using passport then the authentication duties are off-loaded to the passport servers.
Passport uses an encrypted cookie mechanism to indicate authenticated users. The passport users are considered authenticated while the rest are redirected to the passport servers to log in, after which they are redirected back to the site.
Passport Software Development Kit can be downloaded and installed http:// msdn.microsoft.com/library/default.asp?url=/downloads/list/websrvpass.aps.