pszClassName (PSZ) - input

      Window-class name.

    pfnThunkProc (PFN) - input

      Pointer-conversion procedure identifier.

      NULL

        Any existing pointer-conversion procedure is dissociated from this class.

        By default, a class has no pointer-conversion procedure associated with it.

      Other
        The pointer-conversion procedure to be associated with this class.

      rc (BOOL) - returns

        Success indicator.

        TRUE

          Successful completion
        FALSE
          An error occurred.

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