You&#x27;re taking received wisdom from Wikipedia, and it&#x27;s wrong.  Common User Access was for normalizing <i>IBM</i> applications, across its then hardware platforms: the PC, System&#x2F;3x, and System&#x2F;370.  Indeed, it&#x27;s most promiment PC success was 32-bit IBM OS&#x2F;2, which implemented the later CUA 91 and which most definitely wasn&#x27;t DOS.