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Once the Laser Preview window is split into nine zones, you may click the left mouse button on one of
the zones, and, from that point forward, most laser cues will be directed to the zone you selected.
Two-handed keyboard control
Note that the layout of the nine zones is exactly like that of the numeric keypad on your computer
keyboard. Therefore what you can do is use your right hand to press a numeric key to specify the zone,
and use your left hand to press letter keys and trigger individual cues.