Actually, MusicStarter, some programs can distingusish between real mice and touch, but I think that is a library design issue. Cubase has that problem with the buttons on the mixers, bit not the sliders, though it will eventually get it if one hold one’s tongue in a certain way. MYOB just does not ‘see’ touches to the buttons on their self-designed windows, even though they have no problems responding to mouse clicks on them.
Touch screen monitors all require a separate USB (or RS232) connection for the touch functionality as the standard display ports do not have the capability to provide positional input back to the computer in their protocol.
I think this is why Win 7 makes it the default to have only one touch screen and as the primary only. It means that it automatically knows how to map the input stream to the display area. Otherwise, like any of the multi-device touch drivers, the user has to manually map every touch surface to its own monitor.
As it is, using multiple monitors, inital setup of a touch monitor requires telling Win 7 which monitor that really is. It then makes that the primary monitor. Then you have to tell Win 7 exactly where the touch reference points are.