Hi folks, I would like to communicate with an external, line-oriented process, which takes a sequence of one-line commands, each returning an arbitrary number of lines, and waits for another command after each response. So, something like: sendCmd :: (Handle, Handle) -> String -> IO [String] ... main = do handles <- connectToExternalProcess sendCmd handles "do something" resp <- sendCmd "get results" -- needs strict I/O, before "quit"? sendCmd "quit" mapM_ putStrLn resp I've tried using runInteractiveCommand, and several combinations of hFlush, hWaitForInput, etc., but I can't find a combination that actually works. I know this is a sketchy description, but can anyone offer some sample code, or point me toward a program that has similar behaviour? Thanks, Graham