Cyberspace now touches all lives. For some it has become as essential as the telephone or the letter. For others it is still a fearful whisper of technological promise. Sometimes we look on bemused, uncertain why all those little addresses that begin ‘http://’ appear in advertisements, and sometimes we are shocked by the possibilities, when a friend sends letters instantly across the globe through the telephone. When cables and phone lines are allied to computers, this parallel world of cyberspace is created. It is often called a virtual world because it does not exist in tangible, physical reality but in the light and electronics of communications technology. In the virtual world people live virtual lives, alongside their real lives, that may be as substantial as marriage and as insubstantial as checking a television guide. Even those uninterested in the virtual world are affected, often without their knowing.