Sure.  For gnome-shell processes after login, I see:
root@redacted:/home/redacted# ps -elf | grep gnome-shell
0 S redacted    5868     823  4  80   0 - 1040028 poll_s 12:26 ?      00:00:02 
/usr/bin/gnome-shell

That's just one process running as the user who logged in.

And for xrandr:
root@redacted:/home/redacted# env DISPLAY=:0 xrandr
No protocol specified
Can't open display :0

root@redacted:/home/redacted# env XAUTHORITY=/var/run/lightdm/root/:0 
DISPLAY=:0 xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 16384 x 16384
HDMI-A-0 disconnected primary (normal left inverted right x axis y axis)
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
HDMI-A-1 disconnected (normal left inverted right x axis y axis)

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https://bugs.launchpad.net/bugs/1881687

Title:
  Desktop is blank after logging in without a monitor attached

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