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unknwn.h header

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This header is used by Component Object Model (COM). For more information, see:

unknwn.h contains the following programming interfaces:

Interfaces

 
IClassFactory

The IClassFactory interface enables a class of objects to be created.
IUnknown

Enables clients to get pointers to other interfaces on a given object through the QueryInterface method, and manage the existence of the object through the AddRef and Release methods.