I want to use AutoIt and MSAA to test the Calulator for my first step to learn the MSAA The goal to get the button and try to click it Now, I can use "AccessibleObjectFromPoint" to get the button, the codes are Opt("MustDeclareVars", 1) Opt("GUIOnEventMode", 1) Global $oMyError = ObjEvent("AutoIt.Error", "MyErrFunc") Global Const $hOLEACC = DllOpen("oleacc.dll") Run("calc") Global $aMousePos, $aCall While 1 $aMousePos = MouseGetPos() $aCall = DllCall($hOLEACC, "int", "Accessible