1. A parallel processing system for processing in parallel individual data streams in accordance with instruction streams, said processing system comprising: a plurality of instruction memories to store said instruction streams, wherein each said instruction memory stores a respective instruction stream; a plurality of execution units to retrieve said instruction streams from said instruction memories, wherein each said execution unit is associated with one of said instruction memories and retrieves said respective instruction stream from said one associated instruction memory; a plurality of buses to transfer said retrieved instruction streams from said execution units, wherein each said bus is coupled to and associated with one of said execution units to receive and transfer said retrieved instruction stream from said one associated execution unit; and a plurality of processing units to selectively execute said instruction streams transferred by said buses from said execution units, wherein each said processing unit is coupled to each said bus and selects and executes a particular instruction stream transferred by said buses to process an individual data stream.