Component Object Model (COM): The Component Object Model (COM) is a software architecture that allows applications to be built from binary software components. COM is the underlying architecture that forms the foundation for higher-level software services, like those provided by OLE. OLE services span various aspects of commonly needed system functionality, including compound documents, custom controls, inter application scripting, data transfer, and other software interactions.
Distributed COM (DCOM): Microsoft® Distributed COM (DCOM) extends the Component Object Model (COM) to support communication among objects on different computers—on a LAN, a WAN, or even the Internet. With DCOM, an application can be distributed at locations that make the most sense to customer and to the application.
Because DCOM is a seamless evolution of COM, the world's leading component technology, an organization can take advantage of existing investment in COM-based applications, components, tools, and knowledge to move into the world of standards-based distributed computing. As organization do so, DCOM handles low-level details of network protocols so organization can focus on real business: providing great solutions to customers.
Reference:
- Kindel, C. The Rules of the Component Object Model, Microsoft Development Network Library
- Microsoft and Digital Equipment Corporation (1996b), Distributed Component Object Model Specification (Draft Version 0.9) Microsoft and Digital Equipment Corporation.
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