Abstract: A trading system wherein each client and a trader respectively have a metadata generating portion for describing character string type parameters of each operation with metadata including a service type and a service type context which is supplementary information of the service type individually or all together, and a metadata interpreting portion for interpreting the metadata in its entirety. The client requesting a registration, an export, or an import to the trader can include authentication information and authority information in the metadata, whereby an authentication processing portion of the trader performs an authentication processing based on the authentication information and the authority information.

Abstract: A user system for a distributed network whereby a user system which is not provided with a distributed application platform can be connected to a distributed network. A user information unit incorporates therein physical points corresponding to stream and network flow endpoints, respectively. A flow endpoint control channel connects a user signaling unit to the user information unit. The user signaling unit includes distributed communication control means, distributed network service controller, and information unit controller for controlling the user information unit by means of a flow endpoint control signal. The user information unit includes physical point linking unit, and flow endpoint control signal processing unit which cooperates with the user signaling unit by means of the flow endpoint control signal.