Have successfully used the Mac app version on a 3 year old MacBookPro 15” (Intel version) running Snow Leopard. I mounted the Wiimote on a flex arm of a disassembled OttLite desk lamp. To allow it to directly view the laptop’s screen. The light pen was made from the plastic container of White Owl Blunts cigar. The Wiimote was placed approx. 18 inches from the screen slightly to the left (as I am right handed). The result is I have turned my laptop’s screen into a graphics tablet. I do have to delete the bluetooth Nintendo connection setup each time I restart the computer to allow the software to connect on its own. One thing else, the software does not actually produce a white board, far as I can tell. I used a graphics program with a pencil tool and the light pen pressed against the laptop screen to do simple line drawings, If anyone is interested I will be glad to post details on the pen and the Wiimote camera mount construction.
This setup will let me do projected big-screen white-boarding in an auditorium where it is not practical to approach the actual projected image on a screen that is high above my arm level from the stage.