Do you want to do after learning QT can do a little game to online games, so is an introduction to study network programming, will soon be finished Yin Shengyu wrote that the "TCP/IP network programming, network programming for the first time contact feeling really is very easy to understand, for some I/O model of concurrent server also has a little bit of understanding, but the server and the client write can only within the local area network (LAN) connection, with no knowledge across the LAN, searched the only saw some odd terms and answer, want to ask is how to realize the communication of different local area net,