A method system for tracking the state of an entity (e.g., an object) on behalf of a client (e.g., an application program). The states of an entity include up and down. The tracking system of the present invention receives a request from a client to track the state of an entity. The tracking system then...http://www.google.de/patents/US20040153832?utm_source=gb-gplus-sharePatent US20040153832 - Method and system for tracking software components
