Communicating with a Realtor

"Shouting" -- At Least to a Realtor

You can tell email newbie's because they start out USING ALL CAPS, until someone they've sent an email to lets them know that that's the online equivalent of shouting.

What's the equivalent to a Realtor, whose success depends on quickly and efficiently communicating with lots of people, and generally being accessible?

Simultaneously sending/leaving them redundant voice, email, and text messages.

OK in an emergency . . . not cool otherwise.