You can even go back to the original (and still intact) naming definition.
Each of the media director is called moon<device-id>
The core is pluto.
And the Orbiter is capable to travel from moon to moon. And control stuff on the relevant media director.
The onscreen orbiter on any of your media director can change its location, and control a different moon (room). Whenever you hit play media, the media will not play on the orbiter, but on the moon (room, media director), you have selected on the orbiter.
I use this analogy to get things sorted out in my little brain.