is there any chance that i can connect my n900 with my media pc via bluetooth as a keyboard with touchpad?

this would be very nice if someone can make an application.

my idea is:

connect n900 via bluetooth that you can use the n900 like a normal bluetooth keyboard and the whole screen as a "touchpad". the touchpad should only work like a normal touchpad on a laptop. only for moving and clicking with the mouse.

i hope you can understand my question, sorry for my english