... The reason that is not practical, though, is that if you cannot fully reach the whiteboard: Things on the top of the screen will be uncontrollable, where title bars and window buttons reside anyway.
Sorry. Maybe I didnt explain.
I dont want to control top of the screen on the witeboard with ir-led (I cant reach). I can control with mouse&keyboard directly over the laptop, for example, executing a gpaint or tuxpaint and downsizing the window application to downside of the screen, and then go to the big screen (whiteboard), and only paint on this position... I can control all desktop directly on laptop, but I want to write (paint some ideas) over the bigwall to make visible this ideas to all the audience on the room.
Thanks in advance.
The real problem is that I cannot reach the top points to calibrate over the bigscreen because I cannot reach them.