ncp is used to copy files over a network. It will open a TCP connection
to the host given as argument 1 and then call tar to actually copy the
files. Calling ncp without arguments will invoke server mode, that is,
it will sit there and wait for a connection from another ncp.
ncp will tell tar to preserve file ownership and permissions, and tar
will automatically copy directory trees recursively.
ncp will use IPv6 if available.
ncp uses TCP port 8002 for its connections.