Plus key (on keypad) or Return or Space - move on to next slide
Minus key (on keypad) or Backspace - go back to previous slide
E or Escape - to exit
F - go straight to the first slide
L - go straight to the last slide
Click the left (select) mouse button to toggle the pointer on and off if configured.
Obviously, if a delay has been put in between slides then the slide will automatically advance on its own.
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