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Or Win 3.1 looking for whatever shibboleth was in MS-DOS and popping up a scary-looking message if it found another DOS? https://en.wikipedia.org/wiki/AARD_code

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I don’t think anybody remembers this since that code never shipped in retail.

It didn't ship (in the final retail version) only after the tech press of the day exposed what Microsoft had done.

It did ship in the final retail version, in way. It was disabled, but the code was still there, and a flag was all that was needed to enable it.

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