  We consider the production of neutralino, chargino, and charged Higgs boson
pairs in the MSSM framework at future $e^+e^-$ colliders. We show that, for
c.m. energies in the one TeV range and in a ``moderately'' light SUSY scenario,
a combined analysis of the slopes of these production cross sections could lead
to a strong consistency test involving the soft supersymmetric breaking
parameters $M_1$, $M_2$, the Higgsino parameter $\mu$, and $\tan\beta$.
