Terminals adapted to act as relay servers for distributing packets in a client-server network

A data communication network comprising a plurality of terminals and a main server which can handle selective polling of at least one destination terminal selected from terminals by a first server. At least a few terminals of the terminals operate as repeater servers for providing the first server-called data to at least one target terminal. An operation for operating such a data communication network in which at least some of said terminals are operated as a repeater server for delivering the data called from the first server to a target terminal. A network server that acts as the main server in the proposed network or process queue and a network terminal that acts as a repeater server on a proposed network or process. A computer program stored on a data medium in encoded format for use in the proposed network server or network terminal or for implementing the proposed procedures. HE