Great, thanks. Download here:

Download HotkeyNet

Let me give you a simple script for testing. You need one hotkey to rename your Warhammer windows so HotkeyNet can tell them apart, a second hotkey to test whether you can send keystrokes, and a third hotkey to test whether movement keys work (they are more complicated than regular keystrokes).

Code:
<Hotkey Ctrl R>  // PRESS CTRL R TO RENAME WARHAMMER WINDOWS
<RenameWin Warhammer War1>
<RenameWin Warhammer War2>

<Hotkey F1>     // PRESS F1 TO SEND B TO BOTH WARHAMMERS -- 
<SendWinX War1> // SHOULD TOGGLE BOOK
<Key B>
<SendWinX War2>
<Key B>
<Restore>

<Hotkey F2>      // PRESS F2 TO SEND  W TO BOTH WARHAMMERS -- 
<SendWinX War1>  // SHOULD MAKE TOONS MOVE FORWARD
<KeyDown W>
<SendWinX War2>
<KeyDown W>
<Restore>
<HotkeyUp  F2>
<SendWinX War1>
<KeyUp W>
<SendWinX War2>
<KeyUp W>
<Restore>