EXCERPTS:
“If you don’t want every home buyer in the neighborhood traipsing through your open house, then consider letting your listing agent have one just for buyer’s agents and brokers.”
“Broker open houses are promoted exclusively to the brokerage community, and can be effective in educating buyers’ agents on your listing. Many agents sell what they know, so it’s helpful for them to keep your property in mind when they’re working with clients.”
http://www.realtor.com/advice/sell/what-is-an-open-house/?is_wp_site=1