How Do Remotes for Advancing Powerpoint Slides Work?

C

chrisdk

I've seen a few USB remote controllers now for advancing
ppt slides in a slideshow.

What gets sent through the USB port to cause a powerpoint slide show
to advance a slide (or go back a slide)? What commands need to
be sent, and how does this work? Is this documented anywhere?
How can I learn about how these are implemented?
Thanks!
 
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