Отличие openbox от openbox-session

/etc/X11/xinit/xinitrc.openbox
/etc/X11/xinit/xinitrc.openbox-session

...
if [ -z "$DESKTOP_SESSION" -a -x /usr/bin/ck-launch-session ]; then
  exec ck-launch-session dbus-launch --exit-with-session openbox-session
else
  exec openbox-session
fi

$ cat /usr/bin/openbox-session 
#!/bin/sh

if test -n "$1"; then
    echo "Syntax: openbox-session"
    echo
    echo "See the openbox-session(1) manpage for help."
  exit
fi

# Clean up after GDM
xprop -root -remove _NET_NUMBER_OF_DESKTOPS \
      -remove _NET_DESKTOP_NAMES \
      -remove _NET_CURRENT_DESKTOP 2> /dev/null

# Set up the environment
A="/etc/xdg/openbox/environment"
test -r $A && . $A
A="${XDG_CONFIG_HOME:-"$HOME/.config"}/openbox/environment"
test -r $A && . $A

# Run Openbox, and have it run the autostart stuff
exec /usr/bin/openbox --startup "/usr/libexec/openbox-autostart OPENBOX" "$@"