Process Get Windows

#include <Array.au3>
#include <Process.au3>

GUICreate("Test1", 100, 100)
GUICreate("Test2", 100, 100)
GUICreate("Test3", 100, 100)
GUICreate("Test4", 100, 100)
GUISetState()

$aResult = _ProcessGetWindows("Autoit3.exe")
_ArrayDisplay($aResult)

Func _ProcessGetWindows($sProcessName)
    $aWinList = WinList()
    $sWindowsFound = ""
    For $i = 1 To $aWinList[0][0]
        If _ProcessGetName(WinGetProcess($aWinList[$i][0])) = $sProcessName And $aWinList[$i][0] <> "" Then $sWindowsFound &= $aWinList[$i][0] & '|'
    Next
    If $sWindowsFound = "" Then Return -1
    Return StringSplit(StringTrimRight($sWindowsFound, 1), "|", 2)
EndFunc   ;==>_ProcessGetWindows