During idle time, the UI thread is also responsible for processing all messages in the application's Windows message queue.
在空闲时候，该UI线程同样要对应用程序的窗体消息队列中的所有消息进行负责。
Posted when the user presses a hot key registered by the RegisterHotKey function. The message is placed at the top of the message queue associated with the thread that registered the hot key.
WM_HOTKEY消息在用户键入被RegisterHotKey函数注册的热键时发送。该消息将位于消息队列的最前端，并且与注册了这个热键的进程关联。
The system creates a thread's message queue when the thread makes its first call to one of the USER or GDI functions.
所有线程刚生成时都是没有消息队列的。当线程第一次调用特定的函数时，消息队列就被创建了。
The STA thread is either waiting without pumping messages or is performing lengthy operations and is not allowing the message queue to pump.
STA线程或者等待而且不发送消息，或者执行一个长时间的操作而且不允许发送消息队列。
The system maintains a single system message queue and one thread-specific message queue for each GUI thread.
系统有一个系统队列，然后每个GUI线程有一个属于自己的队列。
The system maintains a single system message queue and one thread-specific message queue for each GUI thread.
系统有一个系统队列，然后每个GUI线程有一个属于自己的队列。
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