Hello Donn, Wednesday, February 22, 2006, 4:23:28 AM, you wrote: DC> Could an application reasonably choose between several dispatching DC> systems? For example, I'm working on a Macintosh here, where instead DC> of X11 Apple provides its NextStep based GUI with its own apparently DC> fairly well defined event system. I don't know that system very well, DC> but a MacOS Haskell GUI application would probably want to look in DC> that direction for event integration. Meanwhile, I might want to DC> work with kqueue, on the same platform, because it supports filesystem DC> events along with the usual select stuff. this depends not of John's design of this low-level lib, but on design of higher-level libs that will use it. just for example - Streams lib will allow to switch this manager even at runtime -- Best regards, Bulat mailto:Bulat.Ziganshin@gmail.com