Окно в окне.
Код:
#Include <WindowsConstants.au3>
$hParent = GUICreate('Parent', 400, 400, 200, 200)
GUICtrlCreateLabel('', 0, 0, 0, 0)
GUISetState()
$hChild = GUICreate('MDI', 200, 200, 0, 0, BitOR($WS_CAPTION, $WS_MAXIMIZEBOX, $WS_MINIMIZEBOX, $WS_POPUP, $WS_SYSMENU))
DllCall('user32.dll', 'int', 'SetParent', 'hwnd', $hChild, 'hwnd', $hParent)
GUISetState()
Do
Until GUIGetMsg() = -3
