In this paper we propose a framework that can be used f o r the implementation of reliable multi database system communication protocols. The framework provides transactions on shared write-once objects, termed communication objects, that can be recovered after failures. Also concurrency is supported by recoverable processes. The realization of this framework that can be provided b y means of a distributed coordination kernel, is the focus of this paper. Strategies for communication objects

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... belong t o digerent reliability classes are presented. The application of this framework f o r MDBS transaction processing is shown and the failure behavior of a MDBS communication protocol supporting global serializability through a global two-phase-commit is discussed.