A state control system designed to work in a sequence of processing operations divided into a plurality of states, with jobs specified for performance in each of the states, and to make a transition to the next state on condition that all the jobs have been completed in each state. The state control...http://www.google.com.hk/patents/US5276875?utm_source=gb-gplus-share專利 US5276875 - State control system for a distributed processing system
