Say the Visitor by linking to Vendor site ... ( document.referrer ... )
Description : You are promoting in this page some product on sale in another domain. http://www.m-php.com/sc-m/some_page.html
If your Visitor surfs there from here then he will be cookie marked and the other domain will recognize he is coming from your Site ( This )
If instead Visitor closes this session , remember the URL and buy next time , still the some_page.html on the other Server will pick up the referrer-value [[[ Royalty = referrer ]]] and from there may be initialized a royalty process to pay to the promoter , then only when the order is sent the cookie-value may be updated and re-written into: "popunder=no"... ... this is to be added into this project :-)
This project includes for the comprehension the interaction of three websites :
...read more by referring from the [2]
By alternatively leaving one site or the other, the promotion will refer to the last one visited, also if you surf through an occasional or non-conventioned referrer page [ e.g. : from a search engine result ]
For those who runs a last generation Browser like msie 6.0 for example , to get the Script on work , must first customize the browsers'setting on regard of protection for cookies (set the lowest) and the Iframe restrictions (advanced section) should also be set to minimum.