unix & real time -- is a rewritten UNIX still UNIX?

[Henry Spencer]

Furthermore, anyone who thinks that manufacturer X's Wonderful Realtime
Operating System is going to do *exactly* what he wants is dreaming.
Real-time applications vary too much; the user (or his programmer) is
going to have to write some code no matter what he does.  Doing this
for Unix is no harder than doing it on other systems.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry