Update an objet into an other app

Hello,

I've created an app with an IE object in a GUI.
Code extract :

$obj = ObjCreate("shell.Explorer.2")
...
GUICtrlCreateObj($obj, 50, 50, 500, 500)

It work fine but my code to update this object take much time and it slow down my app

As autoit does not support multi threading I chose to create another EXE to update this IE object
To do that I tried to use this code to get the object but it returns me error

$obj=ObjGet("first_app.exe","Internet Explorer_Server")

Internet Explorer_Server is the ojects' class name given by au3info

Have you any idea to get the object in my second app ?

Thanks