There are words that have a harmless denotation, but once placed in a different context, a new connotation is evident. For example, the word slimy by itself can accurately describe a slug, a cluster of algae, or the feeling on your face after your mastiff has ensured that you were properly welcomed home.
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As James points out, NT is a from-scratch operating system and not based on DOS or any previous OS. Note also that Dave Cutler came from DEC, so it's natural that VMS would come across. Also, NT was originally designed to run on the DEC Alpha chipset.