VOW = Virtual Office Website = Is your client allowing their property to appear on a Virtual Office Website? The listing will be displayed on the internet. If "No" is selected this listing will not go to REALTOR.com, Union Tribune and IDX (advertising websites), listing syndication sites, or any other 3rd party advertising websites.
NAR's Definition: The term Virtual Office Website ("VOW") refers to a Participant's Internet website or a feature of a Participant's Internet website, through which the Participant is capable of providing real estate brokerage services to consumers with whom the Participant has first established a broker-consumer relations (as defined by state law) where the consumer has the opportunity to search MLS data, subject to the Participant's oversight, supervision, and accountability.
For More Details: VOW Q&As