Using WinScriptLive with ShowTouch:
Only one show controller is allowed per screen. It is recommended to instead send information to a single main controller to connect to a single Touch Screen.
Alternatively, multiple ShowTouch for PC instances may be launched on a single computer if needed.
For Legacy Show Touch Software (2.63 and earlier):
Add additional controllers to your touch file by going to "Settings-->Show Controller" screen. Search for the controller and click "add".