[RP] is-wm-query

[twb]

Is there a way of checking if rp is the WM on $DISPLAY?
 (from the shell, that is, so launchers know if they can use rp to add extra 
args)

-twb

-- 
  What is  the sound  of one backpack  EMP weapon discharging?
  -- Joe Thompson

 "Clickety-click" -- Charles Cazabon