Windows used to secretly use green screens to render videos, which is how you could trick MS Paint into becoming a video player

Video playback on old computers was a whole lot of smoke and mirrors. If you opened up the ol' Windows Media player back in the 95, 98 or XP days, brace yourself for a mild shock: it was lying to you.
PC Gamer

Elgato's green screen mouse pad is actually a cool idea

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