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Icon Title Windows
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. Nontitle windows return NULL. Note that
this test is insufficient for top-level windows, because menus and dialog boxes
are owned windows.
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