How Google is managing authentication between multiple domains?

Posted by vaibhav on Stack Overflow See other posts from Stack Overflow or by vaibhav
Published on 2010-04-24T15:02:37Z Indexed on 2010/04/24 15:03 UTC
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Filed under:

google

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authentication

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session

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cookies

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.

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