Is the power steering belt the same as the alternator and the AC?

What is your question?

Our power steering went out, was just replace within the month and the battery drained to dead and car stopped. We were told the AC compressor was going bad and needed to be replaced. Are these all on the same belts? How can we tell if we are being sold a AC compressor when me may not need one? We paid $500 to replace the power steering pump...your site says should be about #350??