If your MLS offers a public view of listing data: You can tell clients how to look up your listings on the Internet, and see the public view.
First tell them the Web address (URL) for your MLS. From the MLS Web page, they can click button labeled "Find a Realtor®" or perhaps "Find an Agent," type in your name and click Submit. Then they can click your name to view your agent information. If they click "See My Listings" they will see all of your active listings.