Parallel processing offers a solution to the problem of providing the processing power necessary to help understand and master the complexity of natural phenomena and engineering structures. By taking several basic processing devices and connecting them together the potential exists of achieving a performance many times that of an individual device. However, building parallel application programs is today recognized as a highly complex activity requiring specialist skills and in-depth knowledge. PARLE is an international, European based conference which focuses on the parallel processing subdomain of informatics and information technology. It is intended to become THE European forum for interchange between experts in the parallel processing domain and to attract both industrial and academic participants with a technical programme designedto provide a balance between theory and practice. This volume contains the proceedings of PARLE '93. The PARLE conference came into existence in 1987 as an initiative from the ESPRIT I programme and the format was revised in 1991/92. PARLE '93 is the second conference with the new format and was held in Munich.

City of Masks is a swashbuckling adventure in a setting reminiscent of Shakespeare's Italy (complete with twins). In the city-state of Bonvidaeo, by custom and law everyone must wear a mask and act in character with it, or face civil, social and religious penalties. Gregorius Bass is sent to Bonvidaeo as the Envoy of Calaria, primarily to get him out from underfoot. Masked as the Innocent Man, and in the company of his radical young Bonvidaoan servant, Bass stumbles into mystery, intrigue, heresy and murder.