====== VNC remote control ======

===== Connect to a running X session =====

<code>
$ x11vnc
</code>

Then connect to host:5901 (usually; uses the first free port above 5900)

===== Display manager with mandatory login is running =====

Obtain its DISPLAY and XAUTHORITY (ps axue | grep [X]AUTH),
<code>
# x11vnc -display DISPLAY -auth XAUTHORITY
</code>
Then connect and log in.

===== Independent X server =====

Run vncserver from tightvncserver package. A new screen is created.