  Flag domains are open orbits of real semisimple Lie groups in flag manifolds
of their complexifications. Certain group theoretically defined compact complex
submanifolds, which are regarded as cycles, are of basic importance for their
complex geometric and representation theoretic properties. It is known that
there are optimal Schubert varieties which intersect the cycles transversally
in finitely many points and in particular determine them in homology. Here we
give a precise description of these Schubert varieties in terms of certain
subsets of the Weyl group and compute their total number for all the real forms
of SL(n,C). Furthermore, we give an explicit description of the points of
intersection in terms of flags and their number.
