@Michael

I think what Excessus is trying to say is allow any player to sign onto any account - however - each account save files are on YOUR computer so if you log onto someone else's account they can't do anything because they don't have YOUR save information. Make the login part just for that, really nothing, but if you sign on to that account on your computer then it loads YOUR save file(s).

Maybe I'm the one that has it wrong now hehe, but that's what I thought when I first read it.