I wondered if someone could give me some basic advice. I have a site selling a service and have been approached by a couple of other sites wishing to place adverts on their site for my site and to receive a commision for every conversion. I obviously could provide them with the banner ad etc but I was wondering how we both keep track of the other. How do I identify which customers have come from a particular site and what can I do to show the introducer that I'm not ripping him off. Is there any software I can buy etc etc. If anyone can point me in the right directiom to mug up on this topic I would be grateful.