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代码说明：

  调用API函数在屏幕上画出窗口区域，并在窗口上设置背景、字体、样式等属性，使用多线程进出许可证的方式创建多个窗口区域，在屏幕上从上到下移动。(Call the API function draw window area on the screen , and set the background in the window , font, style and other properties , the use of multi-threading in and out of the license area create multiple windows , move across the screen top to bottom .)