I have just downloaded the hugs [...] The problem is that I don,t really how to make full use of the graphical capabilities. Would you please sent me some information concerning this matter.

At http://www.dcs.gla.ac.uk/~meurig/TclHaskell/ you will find a link to TclHaskell, which has a GUI and is easy to use. Here, for example, is a short program which opens up a window: let f = do {w <- window []} in start f and here another, which stores the title for the window in a mutable variable: let f = do {ref <- newState "how to use state";valueOfRef <- readState ref;w <- window [];title w valueOfRef} in start f I'd be interested in hearing from anyone who uses TclHaskell.