| Directory Services | Provide a homogeneous view of the network's name spaces, including support for DNS, X.500, AOCE, and DCE. |
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| Service Access Framework | Provides a mechanism for identifying and accessing network services. |
| Message Streams | Provide a consistent mechanism for sending data between tasks on local or remote machines, independent of the underlying protocol. |
| Protocols | Provide support for various standard communications protocols, including TCP/IP, AppleTalk, and Novell. |