In some embodiments, a system includes a service provider having a memory and a processor coupled to each other. The service provider is adapted to provide at least one service instance. A presence generating program is adapted to be located in the memory and the processor adapted to execute the presence...http://www.google.fr/patents/US20080133738?utm_source=gb-gplus-shareBrevet US20080133738 - PROVIDER PRESENCE INFORMATION WITH LOAD FACTOR
