Why do gas stations and pharmacies like Eckerds and Walgreens have a satellite dish on top of them? I understand that it's part of their supply/sales network, and keeping up to date on the pricing and other data is very crucial, but I don't see how a satellite dish is helping them any. From what I know, a satellite dish can only recieve, not send. Is this true? Still, broadband has been out for many years now, why not just hook up all walgreens' stores with that? I am sure Walgreen's relies a lot on such a network, but why would a small gas station need to connected? What exactly are they doing that needs up to date data constantly?