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A heartbeat can be used by a plug-in for timing other events and for monitoring the operational state of the server. You can have the server enable the heartbeat by specifying a positive value for the dwMsHeartbeatPeriod parameter in the Initialize method of the INSSEventNotification interface. If a heartbeat is enabled, the server calls the INSSEventNotification::OnHeartBeat method at the regular intervals of the specified heartbeat period. Setting the dwMsHeartbeatPeriod parameter to 0 (zero) disables the heartbeat.
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