1. A method of capturing on a computer programmed digital electrical tracking system information about activity of a user browser accessing a Web server, the method comprising: providing the user browser with a Web page containing a URL specifying both an address of the tracking system and information that specifies a URL on the Web server; upon receipt by the tracking system of a Web page request from the user browser, determining a Web server URL from the Web page request; identifying and extracting captured information indicating that the user browser has requested the Web server URL, the captured information stored within a database; forming parameter data based upon pre-determined selection parameters from the database; encoding an original URL as part of the tracking system URL path to construct at least one rewritten URL; embedding the rewritten URLs in the response such that a browser request to each of the rewritten embedded URLs is sent to the tracking system; and causing the Web page specified by the Web server URL to be returned to the user browser.