  We consider the gauge-boson sector of a locally SU(2) x U(1) invariant
effective Lagrangian with ten dimension-six operators added to the Lagrangian
of the Standard Model. These operators induce anomalous three- and
four-gauge-boson couplings and an anomalous gamma gamma H coupling. In the
framework of this effective Lagrangian we calculate the helicity amplitudes and
differential and total cross sections for the process gamma gamma --> WW at a
photon collider. We give relations between different parts of the amplitudes
that show which linear combinations of anomalous couplings are measurable in
this reaction. The transformation properties of the differential cross section
under CP are discussed. We find that three linear combinations of CP conserving
and of CP violating couplings can be measured independently of the photon
polarisation in gamma gamma --> WW.
