an interactive computer system that identifies customers when the customer selects a display that appears on an affiliate site . the system connects the customer to the selected merchant site and to the clearinghouse site which frames the customer &# 39 ; s view . the frame lists other network sites that are selected by the clearinghouse site as of possible interest to the customer . sales revenue is generated for a merchant and commission revenue is generated for the referring affiliate based on purchases by an end user customer during the initial and subsequent visits to the clearinghouse site .