the requested cluster c 4 finds the cell z among the cells z included therein whose field position feldid comes closest to the field position feldid of the desired field f 8 for this purpose the cluster c can for example determine the sum of the absolute values of the difference between the cell position zellid and all other neighbouring cell positions zellid in order to select the cell z where the absolute value of such a difference is minimal due to the fact that cells z contain information on neighbouring cells a cluster c can be found in this manner which comprises a cell z with the desired field f 8 the cluster c 4 requested by the client cl relays the find request findrq to the cluster c found in this manner e g to cluster c 6 this operation is repeated until a desired cell z has been found or until cells z are not longer found which are neighbouring cells of the desired cell z preferably a step counter in incremented upon the relay of a find request findrq with each increase of the step counter the respective current cluster c sends a holding response halteak holdingak to the client cl in order to inform same that his request findrq is still be processed if the requesting client cl does not receive such a holding response halteak in this case then.