How does Stack Overflow’s SSO work? … whatever it is they are doing it seems to work for all sites in the network.
I’d like to learn what Stack is doing so I can see if it’s possible to get a similar registration scheme between http://perfmon.com and http://eventvwr.com under ADFS. I understand that SAML and OpenID are different animals, but the concept of transparent registration should be the same.
Q: How does Stackoverflow “federate” with the other sites such as serverfault?
OpenID, One Year Later on SO blog explains how do they solve the problem.
Also, there is a post on the new Global Login Mechanism on the SO blog.