1. A system for a network of computers, including personal compouters, comprising: at least three personal computers; one said personal computer functioning as a master in a parallel processing or multi-processing operation involving at least two other said personal computers functioning as slaves to said master; hardware or software or firmware means for said master personal computer to subdivide said operation into two parts and to send said parts to said slaves for processing by said slaves; hardware or software or firmware means for said at least two slave personal computers to process said operation and send results back to said master when the operation is completed.