3.1.4 Higher-Layer Triggered Events
A higher-layer triggered event is used to immediately start the time synchronization process. This event is triggered by the W32TimeSync method in [MS-W32T]. For example, when an end user wants to immediately initiate synchronization of a client computer's time with that of a server, and when the client computer is configured for authenticated NTP time synchronization, the W32TimeSync method is used to trigger this event. When this event is triggered, the client polling timer specified in section 3.1.2 expires immediately.
The client also responds to two higher-layer triggered events related to domain join and domain unjoin. These higher-layer triggered events are used to modify the configuration of the client when entering or leaving membership in a domain, respectively. For more information on domain membership, refer to [MS-AUTHSOD] section 220.127.116.11.