Importance

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Abstract

According to one feature of the system, a method for updating a file maintained by first, second and third computers. The method comprises steps of the first computer communicating to the second computer a file modification instruction, the file modification instruction including the file identifier and a modification for the file. The third computer issuing to the second computer a request to notify the third computer of a file modification when the master property identifier does not match the property identifier maintained by the third computer. The second computer receiving the request to notify and, in response to the file modification instruction, implementing the modification of the master file whereby the master property identifier changes, and, upon noting that the master property identifier does not match the property identifier maintained by the third computer, issuing a master update to the third computer, the master update including the file identifier, the master property identifier and the modification for the file. The third computer receiving the master update and responsively modifying the version of the file that it maintains and updating the property identifier that it maintains for the file.

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First Claim