Actually the Mac is a bit like CP/M. UNIX was long established and well known to the authors of CP/M. CP/M used a very UNIX-like but stripped down command shell. The people who did DOS copied CP/M and Windows was forced to remain compatible even to this date. With Mac OSX you've come full circle. Mac OS X is not a copy. it's the real deal.I’ll be entering the twelve step program this coming Wednesday when my new MacBook Pro arrives. I’ll probably have PC withdrawals for awhile since I’ve been using a PC since CPM died. I may need some hand-holding to cope.