A method of operating a file server, said method comprising the steps of: receiving a request for a file; determining if the request includes a received identification signal identifying an originating file from which said request originated; comparing any said received identification signal with one or more predetermined identification signals; and deciding which file, if any, is to be supplied in dependence upon said determining and comparing steps, and if in the deciding step it is decided that a file is to be supplied, supplying said file. view more

A method as in claim 1 wherein said request conforms to a hypertext transfer protocol.

A method as in claim 7 wherein said received identification signal includes a universal resource location address for said origination from which the request originated.

A method as in claim 1 in which said file server is connected to the internet and wherein said request is received via the internet.