The Blackout and Pause buttons are found on the far right side of the QuickShow tool bar, just above the Laser Preview window. These functions can also be accessed on the Run menu of QuickShow.
Pressing Blackout will stop all cues from playing, and will also reset the cue mode. This is the quickest and easiest way to stop all laser output.
Pressing the Pause button will Pause all QuickShow functions, including the Beam sequencer.
Blackout can be activated by pressing the ESC key on the computer keyboard. This is normally the top-left key on a computer keyboard. Pause mode can be activated by pressing the PAUSE key on the computer keyboard. This is normally the top-right key on a computer keyboard.