=item B<-server> I<[http[s]://][userinfo@]host[:port][/path][?query][#fragment]>
-The DNS hostname or IP address and optionally port
+The I<host> domain name or IP address and optionally I<port>
of the CMP server to connect to using HTTP(S).
+IP address may be for v4 or v6, such as C<127.0.0.1> or C<[::]> for localhost.
+
This option excludes I<-port> and I<-use_mock_srv>.
It is ignored if I<-rspin> is given with enough filename arguments.
=item B<-port> I<number>
-Act as HTTP-based CMP server mock-up listening on the given port.
-This excludes the B<-server> and B<-use_mock_srv> options.
+Act as HTTP-based CMP server mock-up listening on the given local port.
+The client may address the server via, e.g., C<127.0.0.1> or C<[::]>.
+This option excludes the B<-server> and B<-use_mock_srv> options.
The B<-rspin>, B<-rspout>, B<-reqin>, and B<-reqout> options
so far are not supported in this mode.