Gamemaster
To make sure good gamemastering can happen, four things are needed: some kind of  way for the game masters to know current events and game information; this allows them to make good decisions; decisions need to be put into effect in the game, either through the game system or in person; and finally a way to send messages is needed for both diegetic (sounds you would expect to hear in the game world) or non-diegetic (sounds that are obviously not part of the game world)  communication.