I looked this up - I can't help further because I don't know PCs well enough, but at least it's a little info ...
go here for more:
http://www.microsoft.com/com/tech/DCOM.asp
"The Distributed Component Object Model (DCOM) is a protocol that enables software components to communicate directly over a network in a reliable, secure, and efficient manner. Previously called "Network OLE," DCOM is designed for use ac**** multiple network transports, including Internet protocols such as HTTP. DCOM is based on the Open Software Foundation's DCE-RPC spec and will work with both Java applets and ActiveX® components through its use of the Component Object Model (COM). Follow the links below to learn more about DCOM."