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+# Miscellaneous
+
+This chapter discusses some interfaces that don't really
+fit anywhere else.
+
+## Get Random Number
+
+```c
+uint32_t nng_random(void);
+```
+
+The {{i:`nng_random`}} returns a {{i:random number}}.
+The value returned is suitable for use with cryptographic functions such as
+key generation, and is obtained using platform-specific cryptographically strong random
+number facilities when available.
+
+## Create Socket Pair
+
+```c
+int nng_socket_pair(int fds[2]);
+```
+
+The `nng_socket_pair` function creates a pair of connected file descriptors.
+These file descriptors, which are returned in the _fds_ array, are suitable for
+use with the [Socket transport][socket].
+
+On POSIX platforms, this is a thin wrapper around the standard `socketpair` function,
+using the {{i:`AF_UNIX`}} family and the `SOCK_STREAM` socket type.
+{{footnote: At present only POSIX platforms implementing `socketpair` support this function.}}
+
+This will return zero on success, or an error number. On platforms that lack this
+capability, such as Windows, it will return `NNG_ENOTSUP`.
+
+> [!TIP]
+> This function may be useful for creating a shared connection between a parent process and
+> a child process on UNIX platforms, without requiring the processes use a shared filesystem or TCP connection.
+
+## Report Library Version
+
+```c
+const char * nng_version(void);
+```
+
+The {{i:`nng_version`}} function returns a human readable {{i:version number}}
+for _NNG_, formatted as a `NUL`-terminated string.
+
+Additionally, compile time version information is available
+via some predefined macros:
+
+- {{i:`NNG_MAJOR_VERSION`}}: Major version number.
+- {{i:`NNG_MINOR_VERSION`}}: Minor version number.
+- {{i:`NNG_PATCH_VERSION`}}: Patch version number.
+
+_NNG_ is developed and released using
+[Semantic Versioning 2.0](http://www.semver.org), and
+the version numbers reported refer to both the API and the library itself.
+(The {{i:ABI}} -- {{i:application binary interface}} -- between the
+library and the application is controlled in a similar, but different
+manner depending upon the link options and how the library is built.)
+
+[socket]: ../tran/socket.md