Abstract: In a processor intercommunication network, every pair of processors is connected by a separate path for carrying multi-bit orders so that in an N processor multiprocessing system there are N-1 bidirectional communication paths to and from each of the N processors. To send an order from one processor to another processor each of the N processors has a routing circuit to select the proper path to that other processor. The routing circuit compares the sender's own address to the address of the intended receiver to select the appropriate sending path. Each of the N processors also has a receiving circuit to block orders from any one of the other processors. In blocking orders, these receiving circuits use the receiver's address to determine which one of the N-1 paths is from that of any one processor.