What do GM's do ?

Grunts, Seriously, what do GM's do ? I read in another thread that they don't work on weekends. Is this true ? Can they enter a game unnoticed by the players ? Can they ban a player on the spot ? Or is there some kind of process that has to be followed ? How do you get to be a GM ? Any information you can provide would be most appreciated.

Thanks in advance, Duke

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