During execution, API calls to the operating system in a master processor are transferred to slave processors by an event redirection mechanism, the API calls are then provided to the operating systems of the slave processors by their event redirection mechanisms, such that the same screen or window...http://www.google.de/patents/US5537548?utm_source=gb-gplus-sharePatent US5537548 - Method of computer conferencing by intercepting commands issued by application programs and redirecting to all stations for execution
