[Swordmaker]

Actually, I think OSX is a BSD derivative. I don't think it's Mach. Sword would know.

Apple OS X since Leopard is one of the five certified POSIX^® compliant UNIX^® 03. It is registered and permitted to use the UNIX^® 03 Trademark by The Open Group, the organization which registers UNIX^® 03.

So OS X is a BSD based UNIX^® 03 which uses a MACH micro kernel.

[zeugma]

Thanks Sword. I knew you’d know.