Background

In the 70s, there was MUD. MUD stands for Multi-User Dungeon and it is a text-based virtual world that players connect to through Telnet. Players connect to the MUD and interact with others or the world by inputting commands. They get feedback and information from text description. Later in the 80s, some graphical virtual worlds based on MUD were released. They were actually MUD which changed the present method from text to graphic and from command input to GUI input.

Later, Ultima Online (http://www.uoherald.com/) and EverQuest (http://www.everquest.com/) brought multiplayer virtual worlds to a new level. World of Warcraft (http://www.worldofwarcraft.com) and Second Life (http://secondlife.com/) followed EverQuest and they all made ...

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