“Icon title windows”是什么
MSDN Library Visual Studio 6.0
平台SDK
User Interface Services
Windowing
Multiple Document Interface
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Because MDI child windows may be minimized, an MDI application must avoid manipulating icon title windows as if they were normal MDI child windows. Icon title windows appear when the application enumerates child windows of the MDI client window. Icon title windows differ from other child windows, however, in that they are owned by an MDI child window.
To determine whether a child window is an icon title window, use the GetWindow function with the GW_OWNER index. Non-title windows return NULL. Note that this test is insufficient for top-level windows, because menus and dialog boxes are owned windows.
以上引自MSDN，可我还是看不懂“Icon title windows”是什么东西，还有什么是
“Non-title windows ”？什么叫“top-level windows”？
[解决办法]
Icon title windows：MDI程序中把子窗口全部最小化，这些子窗口就称为Icon title windows
Non-title windows：正常状态的子窗口，即未经过排列（未使用“窗口”菜单中平铺命令等）
top-level windows：显示在最前的窗口
