Why it is not replaced by COM, how it works, network DDE, links to other sources of information. DDE is support is being removed from Windows (Windows 7 x64 seems to have an issue with it)
A file system filter driver intercepts requests targeted at a file system or another file system filter driver. By intercepting the request before it reaches its intended target, the filter driver can extend or replace functionality provided by the origin
Windows Script is a comprehensive scripting infrastructure for the Microsoft® Windows® platform. Windows Script provides two script engines, Visual Basic® Scripting Edition and Microsoft JScript®, which can be embedded into Windows Applications.
these are samples, not complete applications. The code (and coding style) is not meant to be industrial strength; it's not even well-designed. The sole purpose of the samples is illustrating a point, not teaching proper coding style.