Hello, Two independent questions/remarks: 1. 'isEmptyChan x' blocks if x is empty and some other thread is waiting to read from x: Prelude Control.Concurrent> x <- newChan Prelude Control.Concurrent> forkIO $ readChan x Prelude Control.Concurrent> empty <- isEmptyChan x *** Exception: thread blocked indefinitely Is that the intended behaviour? Is it possible to make a non-blocking version? 2. System.Posix.Signals does not export anything on my windows installation: Prelude System.Posix.Signals> :b System.Posix.Signals Prelude System.Posix.Signals> I wanted to include 'installHandler sigPIPE Ignore Nothing' (as mentioned in the documentation of the Network module) in my program to make it more portable. Perhaps 'installHandler' could be set to a constant 'return ()' on windows? My GHC version is 6.2. (Please let me apologise in advance in case (some of) these issues have changed since 6.2.) Regards, Arie Peterson