What's meant by?

Question

a network ready printer?and,
multi-room output?(speaking of a stereo system)

Answer 1

A network ready printer is a printer that can be connected to a network device such as a switch or hub through a cable. You assign the printer an address on the network and then you can attach to it from computers that are plugged into the network device.
A multi-room output stereo system or a multi-room device that can be added has plugs for attaching speakers in other rooms in the location. You can then play music location wide. For example, in a Mall all the stores and in the halls might be playing all the same music from one source over the multi-room system.