TO DO:    Drag a hand with your mouse to change its position.
Hit number keys 1-8 to cycle a hand's state: far → hover → touch → hover → far
NOTE: The camera can tell whether a hand is in its "hover" or "touch" state.
The camera cannot tell one hand from another.
The camera cannot see a hand when that hand is in its "far" state.

Source: displaywall extends BufferedApplet