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I did a bit of a dive on it a while back - it works via peertalk (https://github.com/rsms/peertalk), which in turn works by connecting to local sockets provided by `usbmuxd`.

I haven't tried to reverse it but it's definitely not plain RFB, performance is too good even on an iPad 3 (about the lowest CPU-to-pixels ratio of any iPad ever made). The latency is noticeable enough to be annoying for primary use but it's great for documentation, chat window, etc.

> I am very curious as to how this works.

I'd love to know too.

Really like Duet Display, though I wish the output quality was a bit higher (there's a quality slider in settings, but even on maximum there're lots of JPEG-like artefacts on the iPad display, especially around text).

I set it to the highest resolution it gave me (2xxx x 13xx, can't remember), and it is working great. Maybe it's on the notebook end? I also switched my NVIDIA driver to be used instead of the onboard Intel GPU for Duet.