The tag that connects screens to playlists, and how to design a scheme.
A label is a tag you put on both screens and playlists. A playlist labelled warehouse plays on every screen labelled warehouse, and neither side needs to know about the other.
That indirection is the whole idea, and it is what stops a fleet becoming unmanageable.
What a label is, the three kinds, and why assignment goes through them rather than directly.
Creating, applying, and removing labels, one at a time or across a fleet.
What to label by, worked examples for a few real fleets, and the patterns that go wrong.
The three kinds of label, and working with labels through the API.