How to implement session like stackoverflow?

Question

I'm implementing this kink of login: http://jaspan.com/improved_persistent_login_cookie_best_practice

In this design a new token issued to the user each new login. So it tells me that I need to
Now I need to implement a session, for this login.

I'd like to implement session like stackoverflow, so people can have session as soon as they entered the site, so they don't must to register.

Any ideas how?

Answer 1

I'm going to take a complete stab in the dark here and assume "have a session without a login" is referring to StackOverflow's use of OpenID, which enables you to share one set of login credentials across websites. The user still has a session, but it's the OpenID provider who does the authentication.