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Open MPD is a language extension for programming on distributed memory systems that helps users by having minimal and simple notations. Although MPI is the de facto standard for parallel programming on distributed memory systems, writing MPI programs is often a time-consuming and complicated process. Open MPD supports typical parallelization-based on the data parallel paradigm and work sharing, and enables parallelizing the original sequential code using minimal modification with simple directives, like Open MP. And for flexibility, it allows to combine with explicit MPI coding on parallelization with Open MP for more complicated parallel codes. Experimental results of our implementation show that Open MPD achieves three to eight times speed-up on a PC cluster with eight processors given a small modification to the original sequential code.