Clarification about the word 'PC'
PC is any machine whos lineage comes from the IBM PC. It is a business machine intended to run either DOS, OS/2 or Windows. That's it.
You can put all the overlays of meaning to the word PC you want, but Apple's meaning in their adverts is the one I give above.
By the way, the IBM PC was IBM's answer to the Apple II. Remember those?