Additions to rc.xml

<!-- force screen lock (WIN+L) -->
    <keybind key="W-l">
      <action name="Execute">
        <startupnotify>
          <enabled>true</enabled>
          <name>Lock Screen</name>
        </startupnotify>
        <command>sh -c "/home/$USER/.config/openbox/locker.sh -f"</command>
      </action>
    </keybind>
<!-- inhibit autolock (CTRL+WIN+C) -->
    <keybind key="C-W-c">
      <action name="Execute">
        <startupnotify>
          <enabled>true</enabled>
          <name>Lock Screen toggle</name>
        </startupnotify>
        <command>sh -c "/home/$USER/.config/openbox/cappuccino.sh"</command>
      </action>
    </keybind>