A PIC can indeed do several things at once. It's just a matter of getting familiar with
hardware options the PIC you're using has. Like Melanie already said, firmware is going
to execute line-by-line, but built-in hardware goodies open up a whole new avenue to
real multi-tasking. You just need to get familiar with all your options.

And don't hold back on posting or asking questions here. That's what this forum is for.

I learn something new just about every time I login here just by reading & thinking about
some of the questions asked, so keep em coming. I still have a lot to learn myself..;o}