A Receiver is one A/V receiver on the far end of a liken machine’s HDMI cable. The cable carries the picture and the sound, and the receiver’s own remote or a socket on the network carries the control. equipment-operator reaches the receiver over the network, reports its power, input, and volume, and while a Player plays through it, powers it on, selects the input, and turns its volume from the room’s remote.

Equipment is anything a Player needs to reach the room and that liken does not host. A receiver is the first kind. This site describes the Receiver and the operator that drives it.

Start with the manual. The design and the plans are in the repository.