Suggested reading
Understanding ActiveX and OLE, David Chappell, Microsoft Press, 1996.
Inside COM, Dale Rogerson, Microsoft Press, 1997
Essential COM, Don Box, Addison-Wesley, 1998
Professional DCOM Programming, Dr. Richard Grimes, Wrox Press, 1997
Com and Dcom: Microsoft's Vision for Distributed Objects, Roger Sessions, John Wiley & Sons, 1997