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    STUDIA INFORMATICA - Issue no. 2 / 1999  

  Abstract:  In a distributed system, defţned as a collection of interconnected nodes, the underlying role is taken by the communication subsystem. It func- tions using common protocols which addresses the problem of heterogeneity and homogeneity of the participants nodes, and contributes to the perfor- mance of the whole system. No matter what type: synchronous or asynchronous, the communication software has to be flexible, reusable and adaptable. The formal methods used to model these protocols should reflect these qualities. In this paper, we extend the classical, synchronous and asynchronous mes- sage passing models, proposing an intermediary class of models, starting from some limitations, in time and space, imposed upon the entities involved. We named the new model, half-synchronized transition systems.  
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