While it's not a book, there is a whitepaper available at
http://msdn.microsoft.com/vfoxpro Advanced Visual FoxPro Servers by Calvin Hsia that is very good at describing COM servers.
>are there any good books on creating com and dcom objects with vfp and actually making the objects work?
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John Koziol, ex-MVP, ex-MS, ex-FoxTeam. Just call me "X"
"When the going gets weird, the weird turn pro" - Hunter Thompson (Gonzo) RIP 2/19/05