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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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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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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In that time, as well as reassuring Estelle, Sandra told her to hang a pillow case on the door handle and another out of the window, so crews could tell which room she was in.

BBC: Telford mother thanks 999 fire officer

There were three other mirrors in the house: the mirror over the sink in the upstairs bathroom, the mirror over the sink in the downstairs half bath, and the small circular mirror with a wooden handle that hung on a hook beside the upstairs-bathroom window.

NEWYORKER: Miracle Polish