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Kurzfassung auf Englisch:

Client support for locating, accessing, and using arbitrary services in open system environments emerges as one of the most interesting, complex, and practically relevanmt tasks of realising realistic open distributed system applications. In the context of Open Distributed Processing (ODP), current standartisation efforts for a trading function play an increasingly important role for open system integration. In addition to ongoing ODP standatisation activities official and de-facto standard system environments such as, e.g., the OSF Distributed Computing Environment (DCE), support efficient development and portability of distributed system applications. Therefore, time seems now resdy to analyse and evaluate the use of such platforms also for developing efficient implementations of higher-level system support services, e.g., an ODP trading function. This paper elaborates on the specific potential of OSF DCE for supporting implementations of ODP trader functions. It then presents an architecture and reports on experiences with such an implementation in the context of system support for general service access, management and coordination in open distributed environments within the TRADE project. Finally the paper draws the attention to still existing limitations and deficiencies of OSF DCE for realizing ODP trader functions and proposes respective extensions to OSF DCE both at a conceptual and a concrete system implementation level. According to such prototype implementation experiments, ODP trading functions can be integrated smoothly into a uniform standard system support platform (like DCE) and can be implemented efficiently by extending DCE by additional trading functionswhich specifically support service management, mediation and access for open distributed applications.