Thanks guys, I now have a starting point. I will first try to get computers A and B talking, then find a way to let Vox know that I want to control computer B only so that every command from that point on is only for computer B.
Currently my media computer is where it should be, in the living room, and my main computer is in the office and I also have my work laptop. The new computer I am building is very low powered so it can be kept on all the time and controlled by my plantronic Bluetooth headset. I want this computer to control all the others.
Looks like I will be buying a few more Vox license from you, James.