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In addition, any help window that you create through the API is bound by the actions of its owner. For example, if the user minimizes the calling program, the help window goes away until the owner is restored. If the user exits the calling program, the help window also closes without requiring any action from its owner. Because the calling program created the help window, it can change the position and properties of that window without affecting the procedural help of any other program.
找了很多地方，找到这么一段。
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就用最大化的可以代替。
1<param name="Command" value="MAXIMIZE"/>