Online Sellers Advantage® OSA® is a leading edge Internet technology tool. This state-of-the-art tool equips you with proof that Prudential Hudkins, REALTORS® is leading the way for consumers who use the web to find or sell a home. As a Seller you will receive email alerts on your property - until it sells! Besides the area update, email alerts notify you (1) the number of times your property returned in search results, (2) your home's property details were viewed, and (3) the times your property was added to a prospective buyer's portfolio.