A program that can secretly change your dialup connection setting so that instead of calling your local internet provider, your PC calls are routed to an expensive 0900 or international phone number.
From EULA :
By adding an overlay to text of Web sites you visit. Upon the opening of any World Wide Web Page, the Software scans the Web Page, marks on top of those pages words and/or phrases with a blue underlines and or highlights, for which there are associated Web sites, and creates active links to such sites. This highlighting and underlining are not part of the Web page you are on, but are overlays provided by the Service. When you click on the marked word or phrase, you will be directed to a third party Web site. Links to the associated third party Web sites are provided by the Service are, are not provided by the Web site you are visiting.