AuCloseServer.3x man page
AuCloseServer - disconnect from audio server
Specifies the connection to the audio server.
AuCloseServer closes the connection to the audio server. If the client's close-down-mode is AuCloseDownDestroy, all resources associated with the client will be released. If the client's close-down-mode is AuCloseDownRetainTemporary or AuCloseDownRetainPermanent, the resources associated with the client are retained until the server is reset or AuKillClient is called.
AuOpenServer, AuFlush. AuGetCloseDownMode.
audiolib - Network Audio System C Language Interface