  The similarities in the experimental indications for multinucleon mechanisms
in $(\gamma,p)$ and $(e,e'p)$ processes are pointed out. For both types of
reactions, the substantial role of two-nucleon emission processes for
transitions to high excitation energies in the residual nucleus is stressed. A
microscopic model for the calculation of the two-body knockout contributions to
the inclusive $(\gamma,N)$ reaction is presented. It is based on an
unfactorized formalism for the calculation of electromagnetically induced
two-nucleon emission cross sections. The model is shown to yield a reasonable
description of the overall behaviour of the $^{12}$C$(\gamma,p)$ and
$^{12}$C$(\gamma,n)$ data at high excitation energies in the residual nucleus.
In the calculations effects from non-resonant and resonant pion exchange
currents are included. Photoabsorption on these currents are predicted to
produce the major contributions to the exclusive $^{16}$O$(\gamma,n_0)^{15}$O
process at photonenergies above the pion threshold. Double differential cross
sections for photon induced $pp$ and $pn$ emission from $^{16}$O are calculated
and compared with the data.
