Hi Uwe, I like all the ir led possibilities! Yesterday I have installed your software on my laptop Mac (OS10.5.8); I’ve followed the instructions on preferences etc. And I have come till the callibration of the 4 points. with my ir ledpen. I tried both with the wiiremote on a beamer and on my laptop screen. both give the same result: After the four √ ‘s of the calibration, the irledpen can not be used as a mouse. and I cannot draw or so. The proces stucks. What do I forget? Hope you can help me out, thanks, Maatje (Netherlands)