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The MSDN entry About Windows offers the following definition: A window that
has no parent, or whose parent is the desktop window, is called a top-level window.

https://stackoverflow.com/questions/18244379/what-exactly-is-a-top-level-window-in-win32-programming


A top-level window is a window that is not a child window, or has no parent window
(which is the same as having the "desktop window" as a parent).


The MSDN entry About Windows offers the following definition:
A window that has no parent, or whose parent is the desktop window, is called
a top-level window.