Adding Multiple Touchscreens in Windows 10

Windows 10 offers native touch support for multiple touch devices provided they’re set up as Extend and not Duplicate monitors under Display Settings. 

Note that currently, Windows does NOT offer support for multiple touch devices if you fuse their graphics output together into a unified desktop using NVidia Mosaic and the like as once that’s done the two are reported as one giant monitor to Windows and it only register one touch device per monitor. Hope that makes sense. 

With that caveat out of the way: 

1. Open Control Panel. From the start menu, Control Panel is located in the Windows System folder.  
     

2. From the All Control Panel Items window, click on the view drop-down in the upper right corner and select Small Icons.  
     

3. Open Tablet PC Settings.  
     

4. Click the Setup button.  
     

5. A full-screen window will appear. Touch the corresponding monitor to continue. If the monitor has no touch interface, press enter to continue.  
     

6. Repeat the above steps until the full-screen window disappears.  

That’s it. It’s quite simple really. As you can see above if multiple touch monitors are registered with Windows you can use that interface above to calibrate each and every one if touch accuracy is not perfect. If there's an active Pen registered with Windows this is the place you go to also hone its touch accuracy.