If I don't set the DISPLAY environment variable then it complains
about it not being set.
If I do set the DISPLAY environment variable then it complains about
not being able to use it.
$ openbox-session
which: no hsetroot in [PATH content deleted]
which: no esetroot in [PATH content deleted]
xsetroot: unable to open display 'KWOLCOTT-T61:0.0'
which: no gnome-settings-daemon in [PATH content deleted]
which: no xfce-mcs-manager in [PATH content deleted]
which: no start_kdeinit in [PATH content deleted]
Openbox-Message: Failed to open the display from the DISPLAY
environment variable.