Although most incubators offer their clients office space and shared administrative services, the heart of a true business incubation program is the services it provides to startup companies. More than half of incubation programs surveyed by the National Business Incubation Association in 2006 reported that they also served affiliate or virtual clients. These companies do not reside in the incubator facility. Affiliate clients may be home-based businesses or early-stage companies that have their own premises but can benefit from incubator services. Virtual clients may be too remote from an incubation facility to participate on site, and so receive counseling and other assistance electronically.