Mouseover Macros for 1 PC 2 monitors.

I was working on setting up my Priest alt to heal anyone in my group using Grid. The problem I guess im having is more related to my mouse not passing coordinates to my other monitor or something similar.
Im looking to hopefully use the target=mouseover conditionals in my macros, but be able to mouse over grid on my "tank" and have my priest heal whoever is being moused over in grid with my mouse buttons tied to my priests heals.

The only thing I found in Keyclone was pass mouse clicks, well im not clicking, so i guess is there anyway to duplicate my mouse coordinates on my main monitor to do the same to the 2nd?

Is there no way to pass mouse cordinates to the other monitor? Or is there an easier way im overlooking? Both monitors are the exact same (22 inch wide) and the same resolution as well (1680x1050).

I belive you can move the mous over on the secound wow instance, and then click the button for the mous over macro; wow should be handling the mouse position without the window being in focus, so no need to click either.
In other words; when you want to heal your tank, move your mous from the tanks window to the priest, click the button for heal (mousover macro) and it should go methinks. Although, I can't test that atm. And I don't realy like those kinds of macros anyways :s