保存的私有视图状态中不包括默认行为，如使第一个窗体成为活动窗体。
Default behavior, such as making the first form the active form, is never included in the saved private view state.
最顶层窗体是重叠所有其他窗体的窗体，即使该窗体不是活动窗体或前台窗体也如此。
A topmost form is a form that overlaps all the other forms even if it is not the active or foreground form.
Delphi写的自动抓取当前活动窗体，其中涉及到自定义热键、托盘、限制程序运行个数等。
Delphi written automatically grab the currently active form, which involves a custom hotkey, tray, and so limit the number of program runs.
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