One of the watchwords of computers used to be that they only do one
thing at a time, and they just switch from one thing to another very
quickly.

However, now that cpu's have 2 or 4 cores or more, is that still true?

Does my cpu with 4 cores do up to 4 things at the same time?


Then, if it's supposed to make sounds, more than one core can make
sounds at the same time, right?

But if it's supposed to print something or make an image on the screen,
it can only make one at a time!