How to store credentials or cookies for many sites

I want to create a site similar to Stack Overflow, with blogs / pages / applications for each member and with MVC 3. All functions will be combined with different sites. How can I do this or as a stack overflow? Recently, if I remember correctly, I read that they did this with HTML 5 ...

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I believe that StackExchange sites, including StackOverflow, use OpenID authentication.

You can read a little about this in a recent codingHorror post about licensing for Internet drivers, or check out the OpenID site . This is a simple concept that allows the user to use the credentials that they already have.

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