1. A method for transmitting data between a Web page displayed within the application window at a client device and a server, the method comprising: containing, in the application window of a client device, at least one Web page; transmitting, to a server, an HTTP request initiated by an HTML <form> element; and receiving, from said server, output of an HTTP response associated with said HTTP request into an HTML <iframe> element, wherein the transmitting and receiving actions are accomplished without adding a Universal Resource Locator (URL) to said application's history list.