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LookingGlass on Linux allows displaying from other GPUs' framebuffers.

We use Resolve in VM with hardware passthrough and can monitor its display output from within another VM this way.

Apple nails the prosumer, but I really don't see many using their hardware in industry.

It actually is possible with nVidia GPU-s, but you'll be taking a huge performance hit as some of the tiny bandwidth is now used to send the rendered image back to the laptop and then to the screen.

No matter what, sending it back to the internal display is going to mean a significant performance hit. There's only so much bandwidth in a TB3 connection.