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The Component Object Model Plus (COM+) Tracker Service Protocol, [MS-COMT] enables remote clients to monitor instances of components running on a server. The server end of the protocol tracks the status of component instances and instance containers on the server and implements an interface that clients can use to poll for this status. Optionally, the server can include an event-driven notification system in which the client can supply a callback interface for receiving tracker events. The server calls the client's callback interface whenever new tracking data is available, for example, as a result of local events on the server.
COMT is built on DCOM. The COM+ Remote Administration Protocol [MS-COMA] also provides functionality for obtaining run-time information about instance containers. COMT makes this functionality obsolete by enabling clients to obtain a richer set of information and by providing a push model.
Client applications that require notification receipt using the push model need to use another protocol, such as the Component Object Model Plus (COM+) Event System Protocol [MS-COMEV] to first register the COMT callback interface.
This protocol is most appropriate for monitoring running instances of components when the tracking information is used for informational purposes. It is not appropriate when this information is required for correct behavior of a client application.