Adding open house attendees into the system is a great way to show the sellers or asset managers that the property is being shown.
Collect the business cards of the agents who have previewed a home. Then enter all of those agents as new showings into the system. The sellers will begin to receive feedback from those agents and, as a result, will know that there home is being shown.
Also, if the sellers or asset managers see a consistent theme emerge out of that initial feedback, they may be quicker to make adjustments that will help sell that property faster.