  For a real Enriques surface Y we prove that every homology class in H_1(Y(R),
Z/2) can be represented by a real algebraic curve if and only if all connected
components of Y(R) are orientable. Furthermore, we give a characterization of
real Enriques surfaces which are Galois-Maximal and/or Z-Galois-Maximal and we
determine the Brauer group of any real Enriques surface.
