Commercial speech, however, is less protected by the First Amendment than political speech, and is therefore subject to greater regulation. The Free Press Clause protects publication of information and opinions, and applies to a wide variety of media.
In computer networking, multicast (one-to-many or many-to-many distribution) is group communication where information is addressed to a group of destination computers simultaneously.
Comcast also has a multi-room option called the AnyRoom DVR. It allows you to start watching a recording in one room and finish it in another. The AnyRoom DVR also permits you to watch different recordings on different TVs at the same time and it delivers HD programming on every HDTV in the house.