Here is the second video to demonstrate my application. Here I used my LCD-TV as display, which works fine, because the surface of the tv consists of glass or PLEXI-glass, so it reflects the light of my IR-pen. You have just to calibrate your webcam and your whiteboard is ready for use. The tracking quality of the webcam depends on the quality of the webcam. Mine 10 euro webcam is ok for surfing in the internet and using your desktop, but I thing it is not good enough to draw in paint. Visit: eduard.metzger.googlepages.com to download the program I made and used in this video.