Multi-photon production in e+e- collisions                                     
at centre-of-mass energies up to 202 GeV at OPAL                               
  
      The process e+e- -> gamma gamma (gamma) has been studied                 
      with the OPAL detector at centre-of-mass energies up to 202 GeV. This    
      process is dominated by QED and any deviation of the measured            
      differential cross-section from the well known prediction reveals        
      physics beyond the standard model. These deviations can be parametrized  
      in terms of contact interactions. But also an exited electron e*         
      or a resonance X decaying to two photons can influence                   
      this process. Limits are set on cut-off parameters, the mass of e*       
      and the cross-section for e+e- -> gamma X.                               
  
 Parallel session :5                   
 Plenary  session :6a