Correct me if I'm remembering incorrectly (probably am), but wasn't NT a descendent of DEC VMS?
On Wed, 27 Jan 2016, Mouse wrote:
As I understand it - an important caveat here - Windows NT was to some extent a conceptual descendent of VMS, but that was more because the same person was instrumental in designing both than because there was an explicit inheritance relationship.
Dave Cutler? It also, of course, used a lot of Gordon Letwin's OS/2 code.