I'm now running the script Bettysue posted, and still having the same problem; Shift does not seem to modify the keys being sent to the first/active window. It will modify them to the second window, so that the second character only uses their abilities when shift is held ( which is how I have WoW's keybindings set ), but even with that key held down, the first/active window still treats the numbers as if there is no shift key held.

And, I apologize for my newbishness.