Forgive me if this isn't the kind of question the meta was meant for, but how does a Stack Exchange Open ID work? Is it the same as a normal Open ID? If not, how dos it differ?
Is there a central database that each of the Stack Exchange websites connect to that holds the user information? Is the Stack Exchange Open ID free for any website to use, or is it licensed for only Stack Exchange sites? Is it "top secret"?
I also want to say that I'm not looking for any potential exploits, nor am I wanting to "steal or rip-off" the idea of Open IDs (though I may be interested in participating in it). I just find the idea of a universal login very interesting and useful.