I remember I asked a question like that a long time ago, but my thread disappeared somewhere... Now everyone's searching, but they can't find and they create similar threads in tons.
I wanted to warn you, Dark_River_Clan, that GetLocalPlayer() often causes desynchronization in multiplayer maps, so people disconnect from the game. You got to choose between smooth play and individual multiboards for everyone.
P.S. You can't show more than one multiboard at the same time to a player.