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Distributed analysis environment (DIANE) is the result of R&D in CERN IT Division focused on interfacing semi-interactive parallel applications with distributed GRID technology. DIANE provides a master-worker workflow management layer above low-level GRID services. DIANE is application and language-neutral. Component-container architecture and component adapters provide flexibility necessary to fulfill the diverse requirements of distributed applications. Physical transport layer assures interoperability with existing middleware frameworks based on Web services. Several distributed simulations based on Geant 4 were deployed and tested in real-life scenarios with DIANE.