Could you have added an <img src="http://tracking.example.com/pixel.gif?name=%n http://tracking.example.com/pixel.gif?name=%n"> to the profile, tracking them vi

Could you have added an <img src="http://tracking.example.com/pixel.gif?name=%n http://tracking.example.com/pixel.gif?name=%n"> to the profile, tracking them via the weblogs, or having a era-appropriate CGI script sitting there that kept track of them?