usFrameCode (USHORT)

      Frame code.

      GB_INDEX_FORWARD

        Advance to next bitmap index in circular array.
      GB_INDEX_BACKWARD
        Set to previous bitmap index in circular array.
      GB_INDEX_FIRST
        Set to first bitmap index.
      GB_INDEX_LAST
        Set to last bitmap index.
      desired_bit_map
        Otherwise, use usFrameCode number as the bitmap index.

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