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Peer to peer and grid systems provide attractive middlewares to solve large numerical problems. The development, deployment and execution of applications using those middlewares suffer from the lack of well-adapted advanced tools. There is not any available solution to use the same application on two distinct middlewares. Our article presents the YML Framework which provides supporting tools to design and execute portable parallel applications over large scale peer to peer and grid middlewares. The YML Framework defines a new parallel programming language called YvetteML which is composed of a graph language and a component model. We evaluate the performance of our framework with a simple numerical application using XtremWeb as a middleware.