Multi touchscreen monitor application

Question

I want my .Net C# application to be run several times on a PC with a FirePro 2450 multi monitor video adapter which is connected to four 3M MicroTouch M150 monitors. So I basically have 4 instances of the same app running on a single PC, but each instance is running on a different touch screen monitor. The USB output from each touch screen monitor will be connected to a 4-port USB hub which in turn is connected back to the PC. I think I've figured out how to get each instance of the app to display on each monitor using System.Windows.Forms.Screen.AllScreens but my problem is what to do with the USB input devices. Basically how do I configure each app to take its input from the correct USB output from the correct monitor? Any help would be appreciated.