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Abstract. This paper introduces FlowVR, a middleware dedicated to virtual reality applications distributed on clusters or grid environments. FlowVR supports coupling of heterogeneous parallel codes and is compo-nent oriented to favor code reuse. While classical communication para-digms focus on either a synchronous approach (FIFO channels) or an asynchronous one (sampling), FlowVR enables a large range of inter-mediate policies to better balance the application performance between levels of details, latencies and refresh rates.