Supportman - 9:45 pm on Jun 23, 2011 (gmt 0)
Maybe I don't understand, but he wants to be able to monitor the traffic generated from site X to his site or vice versa. If so, ClickReport.com provides a piece of code that gets embedded on the given landing page. They then provide a CRT tag that needs to be included in the link from where it's posted. Each time someone clicks on the link posted on site X, ClickReport.com will track the IP Address and the user ID of the person that peformed the click.