Card Playing Protocol?

(At a comms protocol level there might always be a single server per game--I don't know yet--but I would like to hide that sort of stuff from users.) There's no need for a central server per game, even running on one of the player's own machines. What is possible with crypto is completely flat distribution of the simulation. The difference is profound. I would suggest that all who don't understand this meditate upon coin flipping protocols, the simplest flatly distributed simulation--here, of a random number generator. Eric