NIS (formerly called Yellow Pages) allows network management of important administrative files (e.g. the password file). For more information refer to the NIS manpage and The Linux NIS(YP)/NYS/NIS+ HOWTO. There is also a book called Managing NFS and NIS by Hal Stern.
Nota: This extension is not available on Windows platforms.
None besides functions from standard Unix libraries which are always available (either libc or libnsl, configure will detect which one to use).
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