Actually I've been playing with it now for a few days, trying to make it work smoothly on a Vaio Z canvas. Going through your code I see the following: ; Set up other constants ; USAGE_PAGE and USAGE might change on different devices. 13/2 works for ; the Surface Pen WM_INPUT := 0xFF USAGE_PAGE := 1...

This script is a small miracle (and the saving grace of an expensive n-trig based tablet I just bought). Thank you!