Segin wrote:
Mac OS X is a fork of FreeBSD, a modern UNIX with
hardware memory
management and protection, preemptive multitasking, complex file systems
and structures, a roburst netowkring API (BSD sockets), etc.
Mac OS X is not, repeat not, a fork of any UNIX. OS X is still a
Mach OS, with a UNIX API based originally on FreeBSD code.
Doc