24. The system according to claim 20 , wherein the description of online activities is a tag included in a redirect message from the Web site, the tag identifying a specific Web page and indicating a prior activity of the user at the Web site.
24. The system according to claim 20 , wherein the description of online activities is a tag included in a redirect message from the Web site, the tag identifying a specific Web page and indicating a prior activity of the user at the Web site. 38. The system of claim 24 , wherein the tag is a graphic that includes a redirect message to an advertising server.