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1. How did you do that with X11? I can't quite remember but I think the solution is wayland-compistor specific...

2. Check out Waypipe, it works really well and supports all application types unlike X11 forwarding. It's more like VNC but easy.

3. Last I checked Zoom screen sharing does work via the browser. The only feature I remember missing was screen control. Same experience with MS Teams too.

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(1) is done by just listening for input events. Any program can, globally. I believe in Wayland it's application-specific?

Yeah, in X anyone can write a keylogger. Or do something really useful with it :-)

(Personally I don't think this is a problem: if the attacker can run programs it's game-over already; just replace "su", "sudo", "firefox", or whatnot with your wrapper script which logs stuff, add ~/.local/bin to PATH by frobbing with shell rc, and presto)

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