A system is shown that supplies web pages from servers (109 to 116, 301 to 305) to requesting clients (102 to 106) over the Internet (101). Each server is configured to supply web page data to requesting clients. A traffic manager (120) receives request data from browsing clients and selects one of the serving devices for serving web page data. A data manipulation station (125) manipulates request data or web page data. The traffic manager supplies a function call to the data manipulation station that includes request data or web page data using Internet protocol. The manipulation station manipulates the request data or the web page data to produce manipulated data and the manipulated date is returned to the traffic manager.