  This is the user's manual of MC@NLO 3.1. This package is a practical
implementation, based upon the HERWIG event generator, of the MC@NLO formalism,
which allows one to incorporate NLO QCD matrix elements consistently into a
parton shower framework. Processes available in this version include the
hadroproduction of single vector and Higgs bosons, vector boson pairs, heavy
quark pairs, lepton pairs, and Higgs bosons in association with a W or Z. Spin
correlations in decays are included for all processes except ttbar, ZZ, and WZ
production. This document is self-contained, but we emphasise the main
differences with respect to previous versions.
