VOID
RtlClearBits(
  IN  PRTL_BITMAP BitMapHeader,
  IN  ULONG StartingIndex,
  IN  ULONG NumberToClear
  );

Routine Description:

    This procedure clears the specified range of bits within the
    specified bit map.

Arguments:

    BitMapHeader - Supplies a pointer to the previously initialized Bit Map.

    StartingIndex - Supplies the index (zero based) of the first bit to clear.

    NumberToClear - Supplies the number of bits to clear.

Return Value:

    None.