As registration authority, the LOC receives and reviews proposed changes; they also have representation on the ISO 639-RA Joint Advisory Committee responsible for maintaining the ISO 639 code tables.
It also includes the special and reserved codes, and is designed not to conflict with ISO 639-2.
The codes in ISO 639-2 have a variety of "scopes of denotation", or types of meaning and use, some of which are described in more detail below.
Remainder groups are afa, alg, art, ath, bat, ber, bnt, cai, cau, cel, crp, cus, dra, fiu, gem, inc, ine, ira, khi, kro, map, mis, mkh, mun, nai, nic, paa, roa, sai, sem, sio, sit, sla, ssa, tai and tut, while inclusive groups are apa, arn, arw, aus, bad, bai, bih, cad, car, chb, cmc, cpe, cpf, cpp, dua, hmn, iro, mno, mul, myn, nub, oto, phi, sgn, wak, wen, ypk and znd.
Microsoft Windows uses the qps language code for pseudo-locales generated automatically from English strings, designed for testing software localization.