If in the wrong section, mods please move.
I was at a photo club meeting the other night. The presenter was 10 feet or so from the computer (Apple laptop - hooked up to a projector).
After he finished discussing a slide, he pushed something in his hand and the next slide would display. Any idea what he used and if a similar device is available for a PC?
Thanks
edit:
found THIS
, anyone have another idea?







