The Solaris 7 operating environment supports the network information service (NIS), the SunOS release 4 name service, and the network information services plus (NIS+), an enterprise-naming service of heterogenous distributed systems. See "NIS+" for the nature of NIS+ support available in the Solaris 7 operating environment.
NIS+ provides improved security, a more detailed model for objects in the name space, and faster updates than NIS.
The NIS+ programmer interfaces are documented in section 3N of the man Pages(3): Library Routines.