On Sunday August 20 2023 15:45:17 Richard L. Hamilton wrote:

>On a Mac, one can have more than one account connected in with a VNC session.

I noticed that some VNC clients (like TigerVNC's vncviewer) require me to 
authenticate 3x: first the system-wide VNC password, then I get the Mac's login 
manager/screen, and then I have to unlock my own session (screensaver password).
On others the login manager step is skipped.

>I think one could have an X11 desktop (on a non-Mac) that used the 
>conventional X11 server but with additional VNC support (module? I forget how 
>it works)

The easiest way is to run x11vnc. TigerVNC has a better version called 
x0vncserver which does the same thing: when a client is connected it snoops the 
entire screen and sends over the changed portions (it uses XDamage IIRC).

BTW, Qt has a VNC QPA (platform module) which causes applications to render 
to/as a VNC server. That's really mostly meant for embedded/firmware 
application on headless systems that don't really need to present dialog or 
open other windows, but it works. From what I read here it's a pity they 
haven't done the same for RDP as apparently that would allow multiple 
windows/dialogs to open.
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