The Component Object Model (COM) and its related COM-based technologies of DCOM, COM+, MTS and ActiveX® comprise the most widely-used component software model in the world.
The Microsoft® Distributed Component Object Model (DCOM) extends the Component Object Model (COM) to support communication among objects on different computers—on a local area network (LAN), a wide area network (WAN), or even the Internet. With DCOM, your application can be distributed at locations that make the most sense to your customer and to the application.
Because DCOM is a seamless evolution of COM, the world's leading component technology, you can take advantage of your existing investment in COM-based applications, components, tools, and knowledge to move into the world of standards-based distributed computing. As you do so, DCOM handles low-level details of network protocols so you can focus on your real business: providing great solutions to your customers.