Right you are, Matt. DirecPC, the one-way Internet satellite transmission system. And while it may be one-way, most of us tend to use the Net that way. The majority of people, after all, are not Internet content providers - they are users. As A One-Way Service.
Every receiver gets the same data.
The only way to provide some selectivity is to broadcast a collection of data over time, and let each receiver catch the data that matches the user's interest as it goes by. 400 Kbps sounds like a lot. I wouldn't care to bet that we'll see widespread penetration before the end of the century. This is a fake email address. So many old members of this list were getting spam generated from siphons trolling the archives that I replaced all email addresses with randomly generated spam traps that forward mail to spam fighters.