• 1. a window handle: 窗口句柄

• 1.Perform a window handle validation of higher process privilege.
  执行高进程权限的窗口句柄确认。
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• 2.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.
  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。
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• 3.If the control's handle does not exist yet, this method searches up the control's parent chain until it finds a control or form that does have a window handle.
  如果控件句柄尚不存在，则此方法沿控件的父级链搜索，直到它找到有窗口句柄的控件或窗体为止。
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