CyBlock Proxy tell me how long somebody has been online

The fact that a user downloaded a Web page to a browser doesn't necessarily mean that he or she was actually looking at that page while it was "open." After all, the user could have suddenly received a phone call, gone to lunch, attended a short-notice meeting, been interrupted by a colleague, or gone to the restroom. Also, users typically have more than one page "open" at a time, but only one is truly viewable, and there is no technical way to know which one. When a computer user clicks on a URL, that action merely constitutes a one-time request for a document, and the "connection" with the server is immediately broken.

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