Unitary representations for two real forms of a semisimple lie algebra; a theory of comparison.- On the classification of primitive ideals in the enveloping algebra of a semisimple lie algebra.- Unitary representations and basic cases.- Left cells in weyl groups.- The selberg trace formula IV: Inner product formulae (final considerations).- Understanding the unitary dual.- Asymptotic expansions of generalized matrix entries of representations of real reductive groups.