Each multicast group is identified by so-called @strong{area}. Area
consists of private/public Curve25519 keypairs for @ref{Encrypted area,
packets encryption}, identity (BLAKE2b-256 hash of the public key) and
-possible subscribers.
+possible subscribers. Areas are created with @ref{nncp-cfgnew} command.
You can make either file or exec transmissions to the areas. Those
ordinary file/exec packets are double wrapped in: