On 09/08/2018 21:06, Helge Kreutzmann wrote:

+Use a separate X display (e.g. "Switch User" in GNOME, or the equivalent 
fast-user-switching feature in other desktop environments),

here probably it is better to say that the user can switch from one to other user with the Ctrl-Alt-Fx keys

+Use ssh, e.g. "ssh -X -oForwardX11Trusted=no otheruser@localhost".

and here, I think it is better to write somethings like:
+Use ssh, e.g. "ssh -X -oForwardX11Trusted=no $OTHERUSER@$LOCALHOST".
+Where $OTHERUSER is the user you want to use to execute commands
+and $LOCALHOST is your localhost (it can be: localhost, 127.0.0.1, ...)

and probably it is better to mention that you need sshd process active in your system (you must install openssh-server).

I don't know if it is better to evidence that with this solution you can have performance problems and not all can work correctly as you expected.

+Allow \fBsu\fR explicit display access by issuing "xhost 
+si:localuser:otheruser" in

and here, I think it is better to write somethings like:
+explicit display access by issuing "xhost +si:localuser:$OTHERUSER"
...

+the originating X session and "DISPLAY=:0 command" under \fBsu\fR.

and here
+the originating X session and "DISPLAY=:0 $COMMAND" under \fBsu\fR.
+or export the DISPLAY variable as "export DISPLAY=:0"
+and then execute all the commands with GUI you like: "$COMMAND &"
+where $COMMAND is the GUI command you like to exec (eg: qcalculate &)

Probably it is better to put some link to documentation
man sshd
man ssh_config
man sshd_config
man xhost
...

Ciao
Davide

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