Steam Machines can support 16 controllers at once.
If you’re more of a fan of local multiplayer gaming than online multiplayer, you may be happy to hear that during the Steam Developer Days conference (being held in Seattle yesterday and today), the company announced that the application programming interface that the Steam Controllers utilize supports up to sixteen simultaneous connections.
This means, of course, that you can (if you have a room large enough) have up to fifteen friends over and be playing all at once on the same machine. The news reportedly brought a round of applause from developers during the conference, as it will likely allow them to do some pretty impressive things with the functionality.
What will the developers utilize this sixteen controller support for? What would you like seen done with it?