Methods, systems and articles of manufacture for performing multiple request processing. Redundant instances of executing entities service requests in a time-delayed fashion, relative to one another. In this way, a user can be returned to an earlier state by switching to the execution flow of one of...http://www.google.com.hk/patents/US7496916?utm_source=gb-gplus-share專利 US7496916 - Service and recovery using multi-flow redundant request processing
