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通知2：WM_QUEUESYNC Notification
The WM_QUEUESYNC message is sent by a computer-based training (CBT) application to separate user-input messages from other messages sent through the WH_JOURNALPLAYBACK Hook procedure.
WM_QUEUESYNC消息是由CBT应用程序送出的，用来区分用户输入的消息和其它由WH_JOURNALPLAYBACK钩子子程发出的消息。
Syntax ：WM_QUEUESYNC
Return Value 返回值
A CBT application should return zero if it processes this message.
如果CBT应用程序处理该消息，返回值应该是0。
Remarks 备注
Whenever a CBT application uses the WH_JOURNALPLAYBACK Hook procedure, the first and last messages are WM_QUEUESYNC. This allows the CBT application to intercept and examine user-initiated messages without doing so for events that it sends.
If an application specifies a NULL window handle, the message is posted to the message queue of the active window.
不管CBT应用程序什么时候使用WH_JOURNALPLAYBACK钩子子程，第一个和最后一个消息都是WM_QUEUESYNC.这样的话，CBT应用程序就能够截取、检验用户初始化的消息，而不需要对它自己送出的程序也这样做。