FSX MULTIPLAYER TOWER CONTROL

When I'm in the tower, how do I let the other players know which taxiway to use to get to a runway for departure? I always here someone calling the tower and then tower control saying: "ORB... taxi and hold short runway... using taxiways Alpha, Bravo,... How do I know which taxiways will lead to the runway?

It helps if you have downloaded a map of the airport from the net, or just learn it off by heart, pop it into your kneeboard if you like. Going from what I can remember, you can also zoom your radar image in, but I cant remember if it shows the taxiways.
There was also something from just flight, which enables you to become a giant arrow to guide 'lost' pilots around.

Thanks Chez

no probs