Answer / cheruku raghu

IUnknown is a type of COM Interface.

Every COM class implements an interface named IUnKnown.

IUnKnown contains three methods:
1) HRESULT QueryInterface()
2) ULONG AddRef()
3) ULONG Release()

Answer / mahesh

Iunknow is the base interface for any com component.
it supports three methods
addref()
release()
queryinterface()

Answer / krithiga.v

IUnknown is the base interface to all other derivable interface.
It contains the methods such as
>queryInterface()
>addRef()
>releaseRef()

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