During synchronization of data between a remote device and a local device, it can be determined if a value for a property on a remote device has changed since a last synchronization of the property between the remote device and a local machine. A remote representation of a property value is compared...http://www.google.com.tw/patents/US7216134?utm_source=gb-gplus-share專利 US7216134 - Determining when a low fidelity property value has changed during a sync
