A method for receiving tailored pages within a browser running on a client device, the method comprising the steps of: browsing, in the browser, pages from a page server; characterised in that the method comprises the steps of: sending from an active page in the browser 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 respective client device; receiving in the active page, from the monitoring server, a control message including an instruction comprising a script for execution by the browser to generate a first party cookie within the browser in the domain of the active page including selected monitoring information; generating said first party cookie within the browser; sending a message to the page server, which message includes said first party cookie including the respective selected monitoring information; and receiving from the page server, at least one page content item selected in dependence on the selected monitoring information included in the first party cookie. browsing, in the browser, pages from a page server; characterised in that the method comprises the steps of: sending from an active page in the browser 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 respective client device; receiving in the active page, from the monitoring server, a control message including an instruction comprising a script for execution by the browser to generate a first party cookie within the browser in the domain of the active page including selected monitoring information; generating said first party cookie within the browser; sending a message to the page server, which message includes said first party cookie including the respective selected monitoring information; and receiving from the page server, at least one page content item selected in dependence on the selected monitoring information included in the first party cookie. sending from an active page in the browser 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 respective client device; receiving in the active page, from the monitoring server, a control message including an instruction comprising a script for execution by the browser to generate a first party cookie within the browser in the domain of the active page including selected monitoring information; generating said first party cookie within the browser; sending a message to the page server, which message includes said first party cookie including the respective selected monitoring information; and receiving from the page server, at least one page content item selected in dependence on the selected monitoring information included in the first party cookie. interactions with and performance of at least one page browsed within the browser running on the respective client device; receiving in the active page, from the monitoring server, a control message including an instruction comprising a script for execution by the browser to generate a first party cookie within the browser in the domain of the active page including selected monitoring information; generating said first party cookie within the browser; sending a message to the page server, which message includes said first party cookie including the respective selected monitoring information; and receiving from the page server, at least one page content item selected in dependence on the selected monitoring information included in the first party cookie.