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We investigate the possibilities for constraining tan beta within the MSSM bycombining the theoretical result for the upper bound on the lightestHiggs-boson mass as a function of tan beta with the informations from thedirect experimental search for this particle. We discuss the commonly used``benchmark'' scenario, in which the parameter values m_top = 175 GeV andM_susy = 1 TeV are chosen, and analyze in detail the effects of varying theother SUSY parameters. We furthermore study the impact of the new diagrammatictwo-loop result for mh, which leads to an increase of the upper bound on mh byseveral GeV, on present and future constraints on tan beta. We suggest a slightgeneralization of the ``benchmark'' scenario, such that the scenario containsthe maximal possible values for mh(tan beta) within the MSSM for fixed m_topand M_susy. The implications of allowing values for m_top, M_susy beyond the``benchmark'' scenario are also discussed.Comment: 11 pages, 5 figures. Minor changes, two references added. Version to  appear in JHE

Constraints on tan β in the MSSM from the upper bound on the mass of the lightest Higgs boson