Abstract
We review interactions between certain 7-planes which are composed out of mutually non-local (p,q) 7-branes and which correspond to specific Kodaira singularities. We discuss in particular how to compute certain moduli-dependent terms in the effective action. These do not only probe the local Chern-Simons terms on the world-volumina, but also certain global aspects of plane interactions that can be attributed to ``torsion'' (or \ZZ_N-valued) D-brane charges.
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