A fault-tolerant computer system employs multiple identical CPUs executing the same instruction stream, each with their own independent memory. The multiple CPUs are loosely synchronized, as by counting events such as operating cycles and stalling any CPU ahead of others. Data output references via separate...http://www.google.de/patents/US5317726?utm_source=gb-gplus-sharePatent US5317726 - Multiple-processor computer system with asynchronous execution of identical code streams
