如果线程A向线程b传递一个窗口句柄，那么，线程B可以通过发送消息给拥有该句柄的窗口对象。

If thread a passes a window handle to thread B, then thread B can use this window handle to send or post messages to the window.

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最常用的非托管资源类型是包装操作系统资源的对象，例如，文件句柄、窗口句柄或网络连接。

The most common type of unmanaged resource is an object that wraps an operating system resource, such as a file handle, window handle, or network connection.

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