  The O(alpha) electroweak radiative corrections to gamma gamma --> WW --> 4f
within the electroweak Standard Model are calculated in double-pole
approximation (DPA). Virtual corrections are treated in DPA, leading to a
classification into factorizable and non-factorizable contributions, and
real-photonic corrections are based on complete lowest-order matrix elements
for gamma gamma --> 4f + gamma. Soft and collinear singularities appearing in
the virtual and real corrections are combined alternatively in two different
ways, namely by using the dipole subtraction method or by applying phase-space
slicing. The radiative corrections are implemented in a Monte Carlo generator
called COFFERgammagamma, which optionally includes anomalous triple and quartic
gauge-boson couplings in addition and performs a convolution over realistic
spectra of the photon beams. A detailed survey of numerical results comprises
O(alpha) corrections to integrated cross sections as well as to angular,
energy, and invariant-mass distributions. Particular attention is paid to the
issue of collinear-safety in the observables.
