Local multiplayer games are gaining popularity on PCs, with games like Samurai Gunn, Towerfall, and the hugely popular Skate or Don't!. But what if a player is on another person's computer but still wants to have their stats saved or use their characters? How can multiple Steam accounts connect at the same time? Here's an idea:
When a player is going to a friend's for local mutliplayer, they request a temporary password from Steam. This would be 6-8 digit, or perhaps a random word. On their friends computer they enter their name and temporary password, and Player 2 is now linked to their account. This temporary account link would only be used for saving stats, and couldn't be used to buy games or anything else. It would also only work for a limited time, maybe a day or so.
With this method players could play local multiplayer games on their friend's computer and have their stats and characters, without having to worry about their account being hijacked. I've thought about implementing something like this myself, but I don't have the time or money to set up a global account system yet. Hopefully someone like Valve will implement something like this so people can play with real friends on real couches.