I know about the nanokernel, yes. Without following the links, Gary Davidian (is that spelled right?) did amazing work.
replyVery very little used it. About the only classic app I ever heard of that could even use pre-emption and background execution were some demanding Photoshop filters. Enough that Daystar Digital built multiprocessor Mac clones just for that alone:
https://lowendmac.com/1995/daystar-genesis-mp/
Within the MacOS kernel it is as coop as ever, and there were no different OSes inside virtual machines. No, Tenon MachTen does not count.
It's totally fair to disagree about whether Mac OS 9 meets the stated requirements. I just don't think it's reasonable to assert that GGGP (who may have made unwarranted claims about OS 9) was actually confusing OS 9 with OS X.
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