Clever use of a "HDMI-to-CSI bridge" gizmo. It allows the pi to capture the HDMI signal from the target PC using it's built-in camera interface. Allowing for boot-up / bios viewing which standard VNC doesn't give you.
There was some great discussion on the Show HN for the similar project TinyPilot:<p><a href="https://news.ycombinator.com/item?id=23927380" rel="nofollow">https://news.ycombinator.com/item?id=23927380</a><p>It uses a Can'tLink:
<a href="https://m.youtube.com/watch?v=daS5RHVAl2U" rel="nofollow">https://m.youtube.com/watch?v=daS5RHVAl2U</a>
Another similar Pi-based KVM is TinyPilot: <a href="https://mtlynch.io/tinypilot/" rel="nofollow">https://mtlynch.io/tinypilot/</a><p>The author was able to use the MJPEG output of the USB HDMI capture devices to get low latency video.