PULONG
RtlSubAuthoritySid(
  IN  PSID Sid,
  IN  ULONG SubAuthority
  );

Routine Description:

    This function returns the address of a sub-authority array element of
    an SID.

Arguments:

    Sid - Pointer to the SID data structure.

    SubAuthority - An index indicating which sub-authority is being specified.
        This value is not compared against the number of sub-authorities in the
        SID for validity.

Return Value: