#include <GUIConstantsEx.au3>

Example()

Func Example()
    ; Set the title of the AutoIt Hidden Window.
    AutoItWinSetTitle("My AutoIt Window")

    ; Display AutoIt's Hidden Window.
    AutoItWinShow()

    While 1
        Switch GUIGetMsg()
            Case $GUI_EVENT_CLOSE
                ExitLoop
        EndSwitch
    WEnd
EndFunc   ;==>Example

; Display AutoIt's Hidden Window. Returns the handle of the window.
Func AutoItWinShow()
    Local $hWnd = WinGetHandle(AutoItWinGetTitle()) ; Get the handle of the AutoIt Hidden Window by finding out the title of the AutoIt Hidden Window.
    WinMove($hWnd, "", (@DesktopWidth / 2) - 250, (@DesktopHeight / 2) - 250, 500, 500) ; Move the AutoIt Hidden Window and re-size for a better view.
    WinSetState($hWnd, "", @SW_SHOW) ; Show the AutoIt Hidden Window, normally this is hidden, but in the interest of this example I'm displaying it.
    Return $hWnd
EndFunc   ;==>AutoItWinShow