Techniques for performing a multi-level patching operation are described. According to one such technique, before a particular patch is applied, the data containers that are targeted by the particular patch are identified. A determination is made as to whether any of these target data containers already...http://www.google.com.hk/patents/US7934211?utm_source=gb-gplus-share專利 US7934211 - Multi-level patching operation
