Search MSDN for event sinks or see e.g. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/swbemsink.asp or http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/receiving_asynchronous_event_notifications.asp
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There are two types of vessels, submarines and targets.