| 摘要 |
A system comprises processing logic, a data structure that contains one or more retrieval codes, each retrieval code comprising a first portion and a second portion, and a network interface by which the system couples to other systems external to the system. The processing logic updates the first portion of a retrieval code in the data structure when the processing logic detects that a file corresponding to the retrieval code has been transferred between the other systems. The processing logic updates the second portion of the retrieval code in the data structure when the processing logic detects that the file has been transferred between locations within a single one of the other systems. |
