23. Apparatus as claimed in claim 4 , wherein the set of tables comprises a dynamic policy table defining code generating attributes which are determined according to the values of time varying parameters.
23. Apparatus as claimed in claim 4 , wherein the set of tables comprises a dynamic policy table defining code generating attributes which are determined according to the values of time varying parameters. 24. Apparatus as claimed in claim 23 , wherein the code generating attributes define image content of the web page code and the time varying parameter is the bandwidth available for communication with the device.