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I'm posting this to let you know where to get the source code .
The link in the book is quite dead. However, if you plug the URL into The Wayback Machine at <http://archive.org> you can get it there. There's also an Errata and some other bits and pieces.
As at 23 June 2013, I'm rereading the book because COM has come up in a project I've been asked to maintain. (Will VB6 ever die?). I can't believe I used to teach this stuff! This has always been the best introduction to COM. Reading it will also give you some real insights into the C++ object model and such religious principles as separating interfaces and implementations.