  This is the user's manual of MC@NLO 2.3. 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, and lepton pairs. This document is self-contained, but we
emphasise the main differences with respect to previous versions.
