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Google now supports federated login; your users can now log into your website or application using their Google account. The goal of federated login is improve the online login experience for everyone by (1) minimizing the number of different names and passwords people need for the sites they visit, and (2) letting developers deploy web sites without setting up a login system. Google's login authentication uses the OpenID 2.0 protocol, which has open source implementations available for a number of different development platforms used by Google Data API developers. (Currently enables for regular Google accounts only.)