Hard scattering of (almost) real photons at HERA

Photoproduction reactions producing large transverse momenta are reviewed, as well as the possibility of using them for tests of perturbative QCD. Pointlike coupling of the photon to the proton constituents is considered in leading log approximation. Although the cross sections of these processes, photon gluon fusion and QCD Compton scattering, get their largest contribution from low Qsq (almost) real photons, they are calculated over the full Qsq range. Photoproduction as a background to the standard deep inelastic physics at HERA and to exotic phenomena is discussed. Heavy flavor production through photon gluon fusion may offer good possibilities of studying charm and bottom quarks. An attempt is made to determine a possible strategy to identify the top quark at HERA.