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We present a new task dissemination scheme called multicast deluge (MDeluge). MDeluge can disseminate tasks into a subset of the sensor network. MDeluge uses a tree which is formed when the source node broadcasts the code version message. The source node keeps the tasks and sends it based on the requests. MDeluge supports newly emerging wireless sensor network architectures with layered structure and mobile sensor nodes. We developed a prototype implementation of MDeluge on TelosB motes. Assuming a grid structured wireless sensor network, we present an analysis of various message costs as well as the overall cost of data messages. Experimentation with the prototype and simulation of MDeluge are done to show the MDeluge performance in static sensor network. Simulation also shows how the performance will be impacted by various parameters in a sensor network with mobile sensor nodes.