...e keyboard)会把操作输入转化成消息存系统队列中然后系统会把此消息放到目标窗口所线程消息队列(thread-specific message queue)中等待解决
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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。
During idle time, the UI thread is also responsible for processing all messages in the application's Windows message queue.
退出队列是一个单线程操作，即使消息流本身配置为多实例时也是如此。
Dequeuing is single threaded, even if the message flow itself is configured for multiple instances.
只有当队列中需要处理的消息太多时才会创建新的mdb实例且发起新的线程。
New MDB instances will get created, and the new threads will be spawned only if so many messages are there on the queue that need to be processed.
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