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Ok. Done laughing. First, NT has bits and pieces of Microsoft's OS/2 in it ... or at least did.

You are laughing because you don't know any better.

NT was a from-scratch operating system. Neither the HAL or the Executive borrow from OS/2.

NT was built on the micro-kernel design philosophy, one of the key advantages of this is to be able to "mimic" other OSs.

NT was intended, originally, to be a successor to OS/2. Even when the goal was changed (and Win32 was born) a character mode OS/2 subsystem was still critical. Why? Because that is where the compilers ran.

Can you see OS/2 type messages? Sure. The internal NT documentation still refers to NT-OS/2. Yet the
statement that NT was a from scratch effort is also
completely accurate.

Of course, maybe you were working in building 2 on Microsoft's campus at the same time I was and have a
different take on it ...
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