  Deep observations of the X-ray Sky have now resolved most of the X-ray
Background. Obscured active galaxies are a key component. The obscured objects
which dominate at fluxes above $10^{-15}\ergpcmsqps$ are discussed and models
in which the growth of wind-blowing active nuclei determine both black hole and
galaxy mass are presented. The power from accretion is large and can easily
influence the gas in a host galaxy, as well as heat the intergalactic medium.
