Irssi-style window switching is the use of a modifier key + a number key to switch to a specific window. For example, one could set up W-3 to switch to the third open window. This is easily accomplished in Openbox by setting up keybindings to execute this little external focus-switching program like so:
<keybind key="W-1"> <action name="execute"> <execute>irssi-focus 0</execute> </action> </keybind> <keybind key="W-2"> <action name="execute"> <execute>irssi-focus 1</execute> </action> </keybind>
and so on.