In case anyone was wondering what this state-threads thing I keep talking about is, here is a sample implementation (in C) as well as a lot of documentation and FAQs that apply to haskell as well. http://state-threads.sourceforge.net/ it should be noted that the chief disadvantage of state threads in C is not an issue for haskell (requiring an alternate IO library) A form of state threads can be implemented in pure haskell using the Poor Man's Concurrency monad described here: http://citeseer.ist.psu.edu/claessen99functional.html assuming you have the ability to use an 'epoll' or 'select' mechanism. However, this is probably not a suitable implementation method for high performance haskell implementations and does not address foreign concurrent calls. John -- John Meacham - ⑆repetae.net⑆john⑈