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The server MUST use timers to ensure that the conversation between itself and its clients remains active. The Windows Management Instrumentation Remote Protocol uses the following timers:
Sink timer: Each asynchronous operation has a corresponding timer, which MUST be initialized to 30 seconds when the server calls the client back using IWbemObjectSink. The timer MUST be reset when the call completes.
Backup timer: Each IWbemBackupRestoreEx has a corresponding timer, which MUST be initialized to 15 minutes when the server receives an IWbemBackupRestoreEx::Pause. The timer MUST be reset when the server receives an IWbemBackupRestoreEx::Resume.
EventPollingTimer: This timer tracks the polling interval specified by the WITHIN clause of an event query. The timer interval is the number of seconds specified in the query. The minimum value of the polling interval is 0.001 (equivalent to 1 millisecond) and the maximum value is 418937 (0xffffffff/1000).
EventGroupingTimer: This timer tracks the grouping interval specified by the GROUP WITHIN clause of an event query. The timer interval is the number of seconds specified in the query. The minimum value of the polling interval is 0.001 (equivalent to 1 millisecond) and the maximum value is 418937 (0xffffffff/1000).