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Process driven software architectures are establishing themselves as prominent examples of distributed software infrastructures. Workflow Management Systems, web service orchestration platforms, Business Process Management support systems are relevant instances of process driven software architectures all of which, as the name suggests, are characterized as having a process perspective. In this paper we show that a (well designed) process modeling language and its execution engine can address the process perspective in different architectures and be (re)used among different application domains resulting in useful tools for the design and the implementation of process-driven applications. This can be achieved by maximizing the suitability of such a language via high expressive power and good separation of concerns. We also show sample process driven architectures, addressing different application domains, that are built with it.