somSelf (M_WPDataFile *) - input

      Pointer to the WPDataFile class object.

    aCBFormat (ULONG) - input

      Atom referring to the clipboard format.

    aPrevious (ULONG) - input

      The last atom passed in or 0 to start from the beggining.

    rv (ULONG) - returns

      An atom referring to a class name, or 0 if finished.

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