web applications - Cross Domain Authentication -

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How am I curious about cross domain certification? for example. If you need to sign in to Google.com to sign in to Orkut.com, then the authentication is done on Google.com and when this cookie sets, my question is how can Orkut.com read this cookie or Does not give any other information?

What could possibly be wrong?

This link may be useful.

Keep in mind, orkut is one of Google's services.

OpenID is another solution that is actually used in the SO.


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