A data network storing data relating to work done by vendors for clients is described. The network includes two or more servers, each server containing (1) an exhaustive vendor data base that contains client-independent vendor data for every vendor, and (2) one or more individual client databases, each containing client information for a single client. The exhaustive vendor data base is replicated between the servers, and the client information for each client is contained by one individual client data base on one server.