property progid

This property returns the progid for the contained ActiveX control. This would have been set in markup for the box. The progid is used to identify the object within the registry and is used to by the application to load the corresponding ActiveX control.
See objectBox::params property for example.

function EnumObjBoxes(startBox)
{
    var sib = startBox;
    while (sib)
    {
        if (sib.tag == "object")
        {
            shell.print("ProgID: " + sib.progid);
            shell.print("ClassID: " + sib.classid);
            shell.print("Window Handle: " + sib.windowHandle);
            shell.print("---------------");
        }

        sib = sib.nextSibling;
    }
}