  A cosmological model with an inhomogeneous viscous dark fluid coupled with
dark matter in a flat Friedman-Robertson-Walker universe is investigated. The
influence of dark matter on the behavior of an inhomogeneous viscous fluid of
this kind, responsible for cosmic acceleration and for the appearance of
different types of singularities, is analyzed in detail. In particular, the
critical points corresponding to the solutions of the background equations in a
useful approximation are obtained explicitly.
