i know it only could be done
by making active x plug-in and requiring the user to install it
Others have pointed out the error in this process. If you MUST track users -- and I've never really understood that concept, save for ad views -- there are any number of Javascript apps that will do the trick far better than ActiveX. That's with the caveat that Javascript might be turned off, in which case, you're screwed anyway.
I've heard good things about Google Analytics, so that might be a good place to start.
----Asim, known to some as Woodrow.