A communication network system in which a plurality of information processing equipments are connected with a communication line for communication of a message. The message contains an information data to be communicated among the information processing equipments. Each of the information processing...http://www.google.de/patents/US5528757?utm_source=gb-gplus-sharePatent US5528757 - Routing system for retrieving requested program by discarding received program identical with stored programs and transferring the received program not identical with stored programs
