| http://www.w3.org/ns/prov#value | - When a user logs on at a workstation, e.g. WS1, WS1 adds to a log-on flag (see FIG. 15A) the UID, an address of the log-on location (i.e. an address of the log-on workstation), an address of program (logical address) which is operated at the log-on workstation and the log-on time, and sends it as a data frame (DF) shown in FIG. 1B to the server WS5-S1.
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