[dr nein]

Caps lock

Scan = radar dish = scans the map once and reveals all enemies

UAV = UAV control thingie = puts a UAV up where you click and reveals enemy units in the area

Artillery = Artillery Guns = Blow shit up

Supplies = nothing? = Drop a crate of supplies at the designated location. If you drop it near the artillery guns or other broken object it will slowly repair

Play around with it in some 32 bot SP. The best commanders are the ones that hide somewhere (usually on the carrier for the USMC) and stay in the map mode the whole time. The noob commanders will never use the command map and only call shit using T which gives them a very limited range.