A numerical program to calculate the photoproduction of prompt photons is presented. The code includes full next-to-leading order corrections to all subprocesses. The results are compared to recent ZEUS data.

The measurements of charm and beauty quark production at the world wide only electron proton collider HERA are reviewed. The results obtained with the H1 and ZEUS detectors are compared to predictions from perturbative Quantum Chromo Dynamics.

Results from analyses of the data taken with the ZEUS detector in 1992 and 1993 are presented. The topics are selected from photoproduction, deep inelastic scattering in neutral and charged current reactions, and large rapidity gap events.

Photoproduction of jets at HERA provides information on the partonic structure of the photon. We report on the latest dijet photoproduction results, for real photons and for photons at low virtualities, measured with the ZEUS detector.