  In the framework of a particular supergravity model which provides a natural
solution to the $\mu$--problem we show how the discovery of a chargino at LEP2
and the measurement of its mass and production cross--section, together with
the measurement of the mass of the lightest neutralino, would determine the
entire Higgs and SUSY spectrum. We give detailed predictions for the Higgs and
SUSY spectrum as a function of the chargino production cross--section, for
constant values of the lightest chargino and gluino masses.
