  In this paper we show how to compute port behaviour of multiports which have
port equations of the general form $B v_P - Q i_P = s,$ which cannot even be
put into the hybrid form, indeed may have number of equations ranging from $0$
to $2n,$ where $n$ is the number of ports.
  We do this through repeatedly solving with different source inputs, a larger
network obtained by terminating the multiport by its adjoint through a gyrator.
The method works for linear multiports which are consistent for arbitrary
internal source values and further have the property that the port conditions
uniquely determine internal conditions.
  We also present the most general version of maximum power transfer theorem
possible. This version of the theorem states that `stationarity' (derivative
zero condition) of power transfer occurs when the multiport is terminated by
its adjoint, provided the resulting network has a solution.
  If this network does not have a solution there is no port condition for which
stationarity holds. This theorem does not require that the multiport has a
hybrid immittance matrix.
