Hi Ben
I use FlightSim Commander all the time, it is not necessary to have 2 PC's. If your graphics card has an output for a second monitor, connect your second monitor to that port, then go to the display icon in control panel and set up the second monitor by ticking the box "Extend my windows desktop to this monitor", you can position the 2 display icons to match how your monitors are in reality, also set the resolution required. Once the second monitor is set up, you can then load FlightSim Commander, it will apear on your main monitor, you then click the Restore Down Button to reduce the size, then drag it across to your second monitor. Hope this is of help.