We study, from the point of view of CR geometry, the orbits M of a real formG of a complex semisimple Lie group G in a complex flag manifold G/Q. Inparticular we characterize those that are of finite type and satisfy some Levinondegeneracy conditions. These properties are also graphically described byattaching to them some cross-marked diagrams that generalize those for minimalorbits that we introduced in a previous paper. By constructing canonicalfibrations over real flag manifolds, with simply connected complex fibers, weare also able to compute their fundamental group.
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