I'm looking at iteratee as a way to replace my erroneous and really inefficient lazy-IO-based backend for an expect like Monad DSL I've been working for about 6 months or so now on and off. The problem is I want something like: expect "some String" send "some response" to block or perhaps timeout, depending on the environment, looking for "some String" on an input Handle, and it appears that iteratee works in a very fixed block size. While a fixed block size is ok, if I can put back unused bytes into the enumerator somehow (I may need to put a LOT back in some cases, but in the common case I will not need to put any back as most expect-like scripts typically catch the last few bytes of data sent before the peer is blocked waiting for a response...) Otherwise, I'm going to want to roll my own iteratee style library where I have to say "NotDone howMuchMoreIThinkINeed" so I don't over consume the input stream. Does that even make any sense? I'm kind of brainstorming in this email unfortunately :-) Dave