  The phenomenological implications of the E6 inspired supersymmetric models
based on the Standard Model gauge group together with extra U(1)_N gauge
symmetry under which right-handed neutrinos have zero charge are examined. In
these models single discrete symmetry forbids the tree-level flavour changing
processes and the most dangerous operators that violate baryon and lepton
numbers. The two-loop renormalisation group flow of the gauge and Yukawa
couplings is explored and the qualitative pattern of the Higgs spectrum in the
case of the quasi-fixed point scenario is discussed. These E6 inspired models
contain two dark-matter candidates. The presence of exotic states in these
models gives rise to the nonstandard decays of the lightest Higgs boson which
are also considered.
