From my Mac OS X Advanced Quickpro guide: it's a combination of the Mach kernel and FreeBSD.
> -----Original Message-----
> From: [EMAIL PROTECTED]
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> mach kernel, IIRC. The old NeXTStep unix.
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> > -----Original Message-----
> > From: Grabowy, Chris [SMTP:[EMAIL PROTECTED]]
> >
> > It is based on some *NIX variant...was it FreeBSD?
