-NNCP (Node to Node copy) is a collection of utilities simplifying
-secure store-and-forward files and mail exchanging.
+@cindex about
+@strong{NNCP} (Node to Node copy) is a collection of utilities
+simplifying secure store-and-forward files, mail and command exchanging.
See also this page @ref{Об утилитах, on russian}.
+@cindex F2F
+@cindex friend-to-friend
+@cindex E2E
+@cindex end-to-end
+@cindex darknet
+@cindex DTN
+@cindex delay tolerant
+@cindex dead drop
+@cindex onion encryption
This utilities are intended to help build up small size (dozens of
nodes) ad-hoc @url{https://en.wikipedia.org/wiki/Friend-to-friend,
friend-to-friend} (F2F) statically routed
-@url{https://en.wikipedia.org/wiki/Darknet, darknet} networks for
-fire-and-forget secure reliable files, file requests and Internet mail
-transmission. All packets are integrity checked,
-@url{https://en.wikipedia.org/wiki/End-to-end_encryption, end-to-end}
-encrypted, explicitly authenticated by known participants public keys.
-@url{https://en.wikipedia.org/wiki/Onion_routing, Onion encryption} is
-applied to relayed packets. Each node acts both as a client and server,
-can use push and poll behaviour model.
+@url{https://en.wikipedia.org/wiki/Darknet, darknet}
+@url{https://en.wikipedia.org/wiki/Delay-tolerant_networking, delay-tolerant}
+networks for fire-and-forget secure reliable files, file requests,
+Internet mail and commands transmission. All packets are integrity
+checked, @url{https://en.wikipedia.org/wiki/End-to-end_encryption,
+end-to-end} encrypted, explicitly authenticated by known participants
+public keys. @url{https://en.wikipedia.org/wiki/Onion_routing, Onion
+encryption} is applied to relayed packets. Each node acts both as a
+client and server, can use push and poll behaviour model.
+Also there is @ref{Multicast, multicasting} areas support.
Out-of-box offline @url{https://en.wikipedia.org/wiki/Sneakernet,
sneakernet/floppynet}, @url{https://en.wikipedia.org/wiki/Dead_drop,
-dead drops} and @url{https://en.wikipedia.org/wiki/Air_gap_(networking),
-air-gapped} computers support. But online TCP daemon with full-duplex
-resumable data transmission exists.
+dead drops}, sequential and append-only
+@url{https://en.wikipedia.org/wiki/CD-ROM,
+CD-ROM}/@url{https://en.wikipedia.org/wiki/Tape_drive, tape} storages,
+@url{https://en.wikipedia.org/wiki/Air_gap_(networking), air-gapped}
+computers support. But online TCP daemon with full-duplex resumable data
+transmission exists.
+Look for possible @ref{Use cases, use cases}!
+
+@cindex GPL
+@cindex free software
+@cindex licence
NNCP is @url{https://www.gnu.org/philosophy/pragmatic.html, copylefted}
@url{https://www.gnu.org/philosophy/free-sw.html, free software}
-licenced under @url{https://www.gnu.org/licenses/gpl-3.0.html, GNU GPLv3+}.
+licenced under @url{https://www.gnu.org/licenses/gpl-3.0.html, GNU GPLv3}.
It should work on all @url{https://en.wikipedia.org/wiki/POSIX,
-POSIX}-compatible systems. Easy integration with existing
+POSIX}-compatible systems. Easy @ref{Integration, integration} with existing
@url{https://en.wikipedia.org/wiki/SMTP, SMTP} servers. Single
-@url{http://yaml.org/, YAML} configuration file.
+@url{https://hjson.org/, Hjson} configuration file.
Why create yet another store-and-forward solution when UUCP, FTN and
even SMTP exists? Look in @ref{Comparison, comparison} section!