HERWIG 6.3 release note

A new release of the Monte Carlo program HERWIG (version 6.3) is now available. The main new features are new (MRS) built-in parton distribution functions, more SM gauge boson production processes, 2 ! 3 MSSM Higgs production processes, an option to handle negative event weights, and an interface to the CIRCE beamstrahlung program.