This isn't really a link, just an idea so I don't lose it. Thinking about interfacing with an RPi, one of the limitations of having multiple displays is the bandwidth required to drive them all at full-speed. What if you don't need to play video on all of them--maybe just one--and could get by with a couple extra displays for UI that run slower?
I'm thinking windowed interfaces could just transmit bitmap deltas and block transfers to handle UI operations, and either would render a sprite bitmap cursor or respond to touch. In any case, the actual bandwidth required isn't that much most of the time, and could be handled using "low-speed" interfaces. Call it "low-bandwidth graphical interface"?
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