Prompt photon, Drell-Yan and Bethe-Heitler processes in hard   photoproduction
  We present prospects and requirements for the study at HERA of hard photon processes which generate high $p_T$ photons in the final state, and processes which generate Drell-Yan lepton pairs. 
P. J. Bussey (University of Glasgow), B. B. Levchenko, A. Shumilin   (Moscow State University)