I have a keyboard which allows for special keybindings and it has a scrollwheel. I have the ability on this keyboard to be able to turn up or down the volume with the scroll wheel but not the brightness on my laptop. With these two programs that are generated from this Solution, I can call each program to set the brightness of my laptop screen. I set each up to be able to take one parameter as the amount you would like to increase or decrease the brightness. If no parameter is passed, then it is increased or decreased by 10%. I also created a shared library in order to reduce the amount of repeated code required for each executable to work properly.
Finally, since all these programs do is turn up or turn down your brightness, there is no user interface.