This package provides head normal form strict versions of some standard haskell concurrency abstractions (mvars,chans), which provide control over where evaluation takes place not offered by the default lazy types. this may be useful for deciding when and where evaluation occurs, leading to improved time or space use, depending on the circumstances. this package provides the documentation for a library for the haskell programming language. see http://www.haskell.org/ for more information on haskell.