  We consider the production of chargino, neutralino and charged Higgs boson
pairs at future linear colliders for c. m. energies in the one TeV range within
the MSSM. We compute the leading (double) and next-to leading (linear)
supersymmetric logarithmic terms of the so-called "Sudakov expansion" at
one-loop level. We show that a combined analysis of the slopes of the chargino,
neutralino, and charged Higgs boson pair production cross sections would offer
a simple possibility for determining \tan\beta for large (\gsim 10) values, and
the parameters M_1, M_2, and \mu. This test could provide a strong consistency
check of the considered supersymmetric model.
