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The TUIO protocol is widely used around the world by many application developers and is a commonly known way to transmit individual touch data.
See a list of compatible software and operating system frameworks here:
The received coordinates can be processed with the TUIO Input node.
You can setup your Screen Coordinates according to your TUIO touch region to generate the correct pixel values in the node. X and Y represent the X and Y offset in pixels of your TUIO region, W and H are width and height, also in pixels.