NNCP consists of several utilities. As a rule you will have the following workflow:
nncp-cfgnewon each node to create an initial configuration file.
nncp-exec(look how Postfix and how Exim SMTP servers could be configured) commands to queue file, freq and exec transmissions. Repeat as many times any time as you wish.
nncp-daemonto accept remotely initiated connections to your node
nncp-callerto initiate connection to required nodes from time to time
nncp-xferwith removable storage devices for copying packets to/from other nodes
nncp-bundlewith either sequential storage devices or broadcasting transmissions for copying packets
nncp-tossfor tossing (decrypting and processing) all inbound queues to receive exec messages, files, file requests and relay transition packets to other nodes.
nncp-cfgencutility. You can always use an encrypted config without decrypting it in temporary memory file.
nncp-cfgminutility. It will be useful for transferring messages with offline methods, but tossing them later on the machine with private keys.