I am using the LXDE desktop environment, which is based on Openbox. I know how to change the key-bindings by editing my `~/.config/openbox/lxde-rc.xml`, e.g.:

```
<keybind key="A-F11">
  <action name="ToggleFullscreen"/>
</keybind>

```

However, I need to make a non-persistent change, which will only be effective for the current session. And I need to make this change from the command line, without editing the XML file.

Is that possible?