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You can also use VNC: https://en.wikipedia.org/wiki/Virtual_Network_Computing https://en.wikipedia.org/wiki/Virtual_Network_Computing

• nsonha 3y ago
  can a VNC client acts as an additional display?
  • zamadatix 3y ago
    The VNC client can display whatever the server sends it. Doesn't even have to actually be images of a desktop at all.
    • nsonha 3y ago
      The question should've been "can a vnc SERVER serves as a virtual display?". On that, I found https://github.com/kbumsik/VirtScreen https://github.com/kbumsik/VirtScreen
      • zamadatix 3y ago
        Many environments also include native virtual display support so you don't even always need a special VNC server. On Linux projects like that tend to just automate it but sometimes it's pretty easily to do manually. E.g. on Sway you just define the virtual display the exact same manner as you do a physical display and then VNC in to only that display. On other operating systems like if it was running native macOS projects tend to do more of the heavy lifting around making the virtual displays actually happen.