It is more obscure than that. Keith Laumer, SF author, invented the Bolo tank with an unwilling transplanted entity's brain. Bolo technology has a red light (button) to show it is quiescent and when pressed active functions appear with a green light button and possibly more red lights to provide a self-defining user interface. I first read it nearly 50 years ago and I was looking forward to such a paradigm in the Cloud.
Complicated,
Acorn
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