A method of monitoring objects in an interactive object-oriented database system. Any of a plurality of client programs can request monitoring of attributes of objects in the database. A record is kept of update transactions initiated by a client. When the client commits the changes, any client which...http://www.google.com.hk/patents/US5133075?utm_source=gb-gplus-share專利 US5133075 - Method of monitoring changes in attribute values of object in an object-oriented database
