Er, also, you're presuming a couple of things:
- they speak your language... I mean, hows your Japanese?
- they can type by touch (I can't imagine hunt-and-pecking during melee)
- they're not too busy finding the on switch to be barking marching orders.
FWIW, I always start each game with a quick greeting, just to see who's awake, and let them know that I am.