  Within the framework of the Minimal Supersymmetric Standard Model (MSSM) the
Higgs masses and LEP II production cross sections are calculated for a wide
range of the parameter space. In addition, the parameter space restricted by
unification, electroweak symmetry breaking and other low energy constraints is
considered in detail, in which case the masses of all SUSY partners can be
estimated, so that their contributions to the radiative corrections can be
calculated. Explicit analytical formulae for these contribution are derived.
  The radiative corrections from the Yukawa couplings of the third generation
are found to dominate over the contributions from charginos and neutralinos.
  Large Higgs mass uncertainties are due to the top mass uncertainty and the
unknown sign of the Higgs mixing parameter. For the low tanb scenario the mass
of the lightest Higgs is found to be below 103 GeV for a top mass below 190
GeV. The cross section at a LEP energy of 192 GeV is sufficient to find or
exclude this low tanb scenario for a top mass below 180 GeV. For the high tanb
scenario only a small fraction of the parameter space can be covered, since the
Higgs mass is predicted between 105 and 125 GeV in most cases. At the
theoretically possible LEP II energy of 205 GeV part of the parameter space for
the large tanb scenario would be accessible.
