Hi, I am trying to align a dzen2 bar to the right of my screen. A dzen2 bar is aligned by giving an offset from the left side of the screen. Since I have a single xmonad.hs for multiple computers, I would like to retrieve the width of the screen from XMonad. I found the following snippet online: main = do (_, out, _, process_handle) <- runInteractiveCommand "echo WIDTH | eval m4 `xrdb -symbols`" ... This does not seem really satisfactory. I know this information is available from inside XMonad, probably in a ScreenDetail from XMonad.Core. My question is: "How can I retrieve this number from XMonad?" Another way look at that the question is: "What is the best way to figure out things in XMonad?" I have a specific question, found a potential candidate in the documentation, and would like to experiment before changing my xmonad.hs. Is there a way to use ghci to look around? Thanks.