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.
This extension has been moved to the » PECL repository and is no longer bundled with PHP as of PHP 5.1.0.
Note: This extension is not available on Windows platforms.