Hello.
I have been trying to get Call of Duty World At War to work for 2 players on the same PC.

I've googled my butt off and found HotKeyNet to be ALMOST what I need to make this work.
I've got a second copy of the executable for CODWAW and am able to load two instances of the game.
I have 2 XBOX 360 controllers. On one instance of the game I enabled controller support through the game's console.
I mapped the keyboard buttons to the second controller using Xpadder. Then I made a HotKeyNet script file to send each key press to the background window.

So far, so good. Player1 can execute all necessary functions using the first controller with controller support enabled. Player2 can move around, aim, fire, etc through the use of Xpadder and HotKeyNet.

Here's my issue: How can I send mouse movements to the background window?
I tried mapping keyboard keys to the look movements, but this isn't practical as I cannot adjust the sensitivity of the keypresses, so Player2's camera is extremely jerky. Is there a way, using HotKeyNet OR ANY OTHER PROGRAM to send the mouse movements to the background window, without giving it focus?