6. A method according to claim 1 and comprising, upon receipt of a response at the client terminal, caching in a local cache any determined rating together with the associated query.
6. A method according to claim 1 and comprising, upon receipt of a response at the client terminal, caching in a local cache any determined rating together with the associated query. 7. A method according to claim 6 and comprising, at the rating server, if it is determined that a rating exists for the query string and that a further component is required to refine the rating, including in the response a format definition for a further query and additionally caching in the local cache the format definition.