Abstract: Tailored pages are received within a browser running on a client device. Pages from a page server are browsed and the browser sends from an active page to a monitoring server, at least one monitoring message including information concerning at least one of: interactions with and performance of at least one page browsed within the browser running on the client device. A control message is received in the active page, from the monitoring server including an instruction to generate a cookie within the browser including selected monitoring information. The cookie is generated within the browser and a message is sent to the page server, which message includes the cookie including the selected monitoring information. From the page server, at least one page content item is received that has been selected in dependence on the selected monitoring information included in the cookie.