In a multiplayer session, game state information is communicated between multiple machines over an internet connection rather than residing solely on a single computer.
尽早规划多人
因为多人游戏当做单击游戏一样可以正常运作，反之则不一定，因此如果程序将来有多人需求的话，应尽早在最开始就朝着多人的方向来规划。
Client-Server模型
In a single-player or local multiplayer game, your game is run locally on a standalone game. Players connect input to a single computer and control everything on it directly, and everything in the game, including the Actors, the world, and the user interface for each player, exists on that local machine.