Here is part of a post from @Carl from the Help rename Roon Speakers thread:
For your server you’ll want to install the RoonServer, and configure it from the Android Tablet, laptop, or desktop. The Laptop and desktop should just use the regular installations and the tablet the android app, obviously. In the current state all three will be able to control the output (and settings) on your server, or their own audio output as a private zone. In the future you should be able to control each output from any other output.
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