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Top 100 Interview Questions & Answers in a convenient and easy to read book!

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  1. Submitted By: amolh — October 6, 2006
    +2 votes
      + -

    IUnknown as an interface of a COM object. Every COM object has to support IUnknown, besides optionally adding other interfaces.

    I would love to, but unfortunately cannot explain what COM interfaces are, in this short comment. Please refer to any COM text for a description.

    IUnknown is made of QueryInterface, AddRef and Release.

  2. Submitted By: Gopal_Rao — October 6, 2006
    +1 votes
      + -

    IUnknown is the Basic COM interface on which all others are based on.
    The Three methods of IUnknown are
    1) QueryInterface
    2) Addref
    3) Release
    All the COM interfaces inherit these three methods from IUnknown.

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