diff -ur v1/chat_conn.py v2/chat_conn.py
--- v1/chat_conn.py	2019-08-10 00:25:07.000000000 +0900
+++ v2/chat_conn.py	2019-08-11 23:59:01.000000000 +0900
@@ -220,7 +220,7 @@
 		elif s == 'names':
 			r = ' '.join( conn_lst.names() )
 		elif s == 'other_names':
-			r = ' '.join( other_names(conn) )
+			r = ' '.join( conn_lst.other_names(conn) )
 		elif is_lock_unlock(s):
 			return
 		conn.send_from('srv', r)
@@ -377,9 +377,65 @@
 
 	return e.to_attr( locals() )
 
+def cli(host, port, name0):
+	cli = cli_new(host, port, name0)
+	th_quit = threading.Event()
+
+	def th_func():
+		rest = rest_new()
+		while not th_quit.wait(0):
+			if not readable(sys.stdin):
+				continue
+			s = sys.stdin.readline()
+			if not s:
+				break
+			cli.send_to('', s)
+
+	th = threading.Thread( target=th_func )
+	th.daemon = True
+	th.start()
+
+	while True:
+		r = cli.recv_split()
+		if r == False:
+			break
+		if not r:
+			continue
+		(f, s) = r
+		if f:
+			s = '{}> {}'.format(f, s)
+		print(s)
+
+	th_quit.set()
+	th.join()
+	cli.dis_conn()
+
+def help(v):
+	ss = [
+		'Usage: {} <port> [conn [<user name>] [<hostname>]]'.format(sys.argv[0]),
+		'  conn: client mode',
+		'  user name: default "guest"',
+		'  hostname: default "localhost"',
+	]
+	print('\n'.join(ss))
+	sys.exit(v)
+
 if __name__ == "__main__":
-	if sys.argv[1:]:
-		srv( int(sys.argv[1]) )
-	else:
-		print('Usage: {} <port>'.format(sys.argv[0]))
+	arg = lambda i, def_v=None: sys.argv[i] if sys.argv[i:] else def_v
+
+	port = int( arg(1, '-1') )
+	if port < 0:
+		help(1)
+
+	kind = arg(2)
+	if not kind:
+		srv(port)
+		sys.exit(0)
+	if kind != 'conn':
+		help(2)	
+
+	name0 = arg(3, 'guest')
+	host = arg(4, 'localhost')
+
+	cli(host, port, name0)
 # EOF