A scheduling system is provided including a server running a scheduling application and a plurality of clients running replicas of the scheduling application. A user interface is presented to a client for creating a repeating calendar event. The user interface includes a field to designate candidates...http://www.google.com.tw/patents/US20070174104?utm_source=gb-gplus-share專利 US20070174104 - METHOD AND SYSTEM FOR ROTATING ROLES IN CALENDAR EVENTS