Fix found by user ES128 for dual monitor touch -
I just set up a dual monitor configuration with a SX2210T and a ST2220T on Windows 7. I got the touch features working properly on both. At first, touching either one was reflecting input only on the primary (whichever one was set as primary at the time), but after messing with the settings I got it working the way I wanted. I tried several things, but I think the right thing to do is to go into the Tablet PC Settings window from the control panel and press the Setup button next to "Configure your pen and touch displays". It asks you to touch each screen and you are done. 2-point multi-touch working on each monitor, although not both simultaneously. At some point I switched which one would be treated as primary, and that caused the touches on one monitor to reflect on the other and vice versa. Following the same steps as above again straightened it out.
Touchscreen Troubleshooting -
* Disconnect the 2nd monitor from the PC. Restart the PC so it only shows one monitor in the Device Manager. Depending on your operating system, load the following -
SX2210T Driver (Windows 7 only)
SX2210T Touch Application
SX2210T Touch Cam
SX2210T Facial Recognition Application (not needed, only if you want it)
* Test the Touch Screen Feature on the single monitor.