RSExecute: I've got Microsoft Scripting Libary 1.0a

> Copyright 1999 Microsoft Corporation. All Rights Reserved.

Versions above are from the article [1].

XML Data Islands network requests:

    <OBJECT width=0 height=0
      classid="clsid:550dda30-0541-11d2-9ca9-0060b0ec3d39"
      id="xmldso">
    </OBJECT>
    <SCRIPT for=window event=onload>
      var doc = xmldso.XMLDocument;
      doc.load("books.xml");

JSONP: I've referred it as an idea of loading data in remote <script> callback.

>>>> You could even do that before XmlHttpRequest

MSXML is just a widely deployed ActiveX control, not part of the browser like favicon. Anyone could implement it or java applet.

[1] https://daurril.org/wrox/ASPToday/990930-191.htm