Touchsmart TUIO is an open-source Windows XP/Vista application to generate TUIO output from Nextwindow API-compatible touchscreens, such as the ones on HP Touchsmart PCs.
It outputs TUIO in the same formats (OSC, flosc-less Flash XML) as Touché, the stand-alone optical multitouch tracker for OS X.
More info: gkaindl.com/software/touchsmart-tuio