  We describe a Monte Carlo event generator for the simulation of baryon- and
lepton-number violating processes at supercolliders. The package, {\HERBVI}, is
designed as a hard-process generator interfacing to the general hadronic event
simulation program {\HW}. In view of the very high multiplicity of gauge bosons
expected in such processes, particular attention is paid to the efficient
generation of multiparticle phase space. The program also takes account of the
expected colour structure of baryon-number violating vertices, which has
important implications for the hadronization of the final state.
