.PP
At present, only one address family is understood.
.TP
-.BI "INET " address " " port
+.BI "INET " address " \fR[" port \fR]
An Internet socket, naming an IPv4 address and UDP port. On output, the
address is always in numeric dotted-quad form, and the port is given as
a plain number. On input, DNS hostnames and symbolic port names are
-permitted. Name resolution does not block the main server, but will
-block the requesting client, unless the command is run in the background.
+permitted; if omitted, the default port 4070 is used. Name resolution
+does not block the main server, but will block the requesting client,
+unless the command is run in the background.
.PP
If, on input, no recognised address family token is found, the following
words are assumed to represent an