hwnd (HWND) - input

Handle of the window whose child windows are to be enumerated.

HWND_DESKTOP

Enumerate all main windows
HWND_OBJECT
Enumerate all object windows
Other
Enumerate all immediate children of the specified window.

henumHenum (HENUM) - returns

Enumeration handle.

This is used in subsequent calls to the WinGetNextWindow function to return the immediate child-window handles in succession.

When the application has finished the enumeration, the enumeration handle must be destroyed with the WinEndEnumWindows call.

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