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MFC COM 

A subset of MFC is designed to support COM, while most of the Active Template Library (ATL) is designed for COM programming. This section of topics describes MFC's support for COM.

Active technologies (such as ActiveX controls, Active document containment, OLE, and so on) use the Component Object Model (COM) to enable software components to interact with one another in a networked environment, regardless of the language with which they were created. Active technologies can be used to create applications that run on the desktop or the Internet. For more information see Introduction to COM or The Component Object Model.

Active technologies include both client and server technologies, including the following:

For a discussion of what is still called OLE versus what is now called active technology, see the topics on OLE.

Also, see Knowledge Base article Q248019 : HOWTO: Prevent Server Busy Dialog Box From Appearing During a Lengthy COM Operation.

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