29. The computer-readable medium recited in claim 27, in which the step of receiving a request further includes the step of receiving a request from the client, wherein the request includes a value of TRUE specified for a "selective" parameter.
29. The computer-readable medium recited in claim 27, in which the step of receiving a request further includes the step of receiving a request from the client, wherein the request includes a value of TRUE specified for a "selective" parameter. 30. The computer-readable medium recited in claim 29, wherein the step of selecting a first node is performed in response to said request including said value of TRUE specified for said "selective" parameter.