  The statistical model proposed in an accompanying paper is generalized to
treat multiport scattering problems. Attention is first focused on two-port
lossless systems and the model is shown to be consistent with Random Matrix
Theory. The predictions are then tested by direct numerical simulation for a
specific two-port cavity. Formula are derived for the average transmission and
reflection coefficients in terms of the port radiation impedance. The cases of
cavity with multiple ports, and with a single port and distributed losses are
compared.
