程序集只能访问安全子窗口进行绘制，并且只能使用该子窗口中的控件(按钮、下拉框等)。在浏览器内运行的代码即属于安全子窗口。

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Assemblies only have access to safe subwindows for drawing and can only use controls (buttons, dropdown boxes, and so on) within that subwindow. Code running within a browser is an example of a safe subwindow.

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