A method of distributing status information is described, regarding a digraph in a logically organized system of groups of entities related to each other and to be represented by digraphs, and a device for using such a method. In a system which comprises a number of groups which may be represented by...http://www.google.de/patents/US5241673?utm_source=gb-gplus-sharePatent US5241673 - System for garbage collecting unused memory space represented by a digraph by assigning values of node identifiers to selected variables based upon predetermined conditions
