| 摘要 |
Some embodiments disclose a method of tracking usage of a client computer. The method can include: (a) receiving a first request for a first file from the client computer; (b) assigning first identifying information to the client computer, the first identifying information is associated with the client computer; (c) providing the first file with a first header to the client computer, the first header comprises the first identifying information; (d) receiving a first conditional request for the first file from the client computer, the first conditional request comprises second identifying information; (e) accessing first data about the client computer using the second identifying information after receiving the first conditional request if the first identifying information is the same as the second identifying information; and (f) instructing the client computer to display at least one second file after receiving the first conditional request if the first identifying information is the same as the second identifying information. Other embodiments are disclosed in this application.
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