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I think everyone here would be knowing that, if I am logged in any of the google's website(i.e www.orkut.com), I don't need to authenticate again for www.gmail.com.
How google is managing this. I think, it would be a cookie stored on user's browser. But, if it is a cookie, how different domains are able to read this cookie. What do you say.

Vaibhav Jain
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    Exact duplicate : http://stackoverflow.com/questions/1047596/cross-domain-authentication – JRL Apr 24 '10 at 15:34

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They use a system simmlar to OpenID

http://www.windley.com/archives/2006/04/how_does_openid.shtml

Kmaid
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