+ specifying a port number to connect to.
+Fifth argument PROTOCOL is a network protocol. Currently 'tcp
+ (Transmission Control Protocol) and 'udp (User Datagram Protocol) are
+ supported. When omitted, 'tcp is assumed.
+
+Output via `process-send-string' and input via buffer or filter (see
+`set-process-filter') are stream-oriented. That means UDP datagrams are
+not guaranteed to be sent and received in discrete packets. (But small
+datagrams around 500 bytes that are not truncated by `process-send-string'
+are usually fine.) Note further that UDP protocol does not guard against
+lost packets."