A network (10) of mobile computing devices (18) communicates by receiving and rebroadcasting messages using wireless transmission. A message is initiated by first mobile computing device and transmitted to a set of other mobile computing devices which may be selected on an ad hoc basis. The...http://www.google.de/patents/US5740363?utm_source=gb-gplus-sharePatent US5740363 - Method and apparatus for low power communications between mobile computing devices 
