Can anyone give me a brief explanation (or show me where in the web I can find some info) about using the profiling library in GHC? Is it avaible for > Windows 98/NT?

There's documentation on GHC's profiling facilities here: http://www.haskell.org/ghc/docs/latest/set/profiling.html And yes, profiling is available with the Windows version of GHC. Cheers, Simon