20. The context server of claim 19 , wherein the context server, the resource accessed by the client device, and the second resource are included within a data center.
19. The context server of claim 14 , wherein: the context discoverer receives second user-context information associated with the particular user of the client device, wherein the second user-context information is received from a second resource; the context manager stores the second user-context information in the context repository in accordance with the particular context model and in accordance with the particular set of rules; the context request includes a request for at least a portion of the second user-context information; and the retrieved context information includes the at least a portion of the second user-context information.