From Leithauser Research:
Web Padlock blocks other Web browsers (Internet Explorer, Netscape, America Online) from running, leaving Web Padlock as the only available Web browser. In order to view any Web page on Web Padlock when Web Padlock is in the locked mode, that Web page must have been added to the authorized Web page list. A user selected password is required to add Web pages to this list. Web Padlock can be unlocked using the password to allow free Web surfing using Web Padlock or other Web browsers, like Internet Explorer. This way, Web Padlock can be used to not only control what sites are visited, but when the Web can be accessed.