Well, actually, the virtual keyboards would be unique to each of the extra machines (ie, B,C,D,&E). So, I'd be cloning the two screens on the main graphics card which is running WoW and the virtual keyboard would be running on a third screen which is being handled by a second, el cheapo graphics card.

Another nice thing about using the virtual keyboard app is that I should be able to code in multicasting. So I could use one touchscreen to control any combination of multiple machines, or have a virtual keyboard for each extra machine, depending on the class loadout I want to do.