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A computer virus is a program which, after being loaded into a computer's memory, copies itself with the purpose of spreading to other computers. Most people, from the corporate level power programmer down to the computer hobbyist, have had either personal experi ....

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.... that have otherwise been protected from external contamination. 3. Telecommunications: also known as a Wide Area Network, this entails the connection of computer systems to each other via modems, and telephone lines. This is the vector most feared by computer users, with infected files being rapidly passed along the emerging information super-highway, then downloaded from public services and then used, thus infecting the new system. 4. Spontaneous Generation: this last vector is at the same time the least thought of and the least likely. However, because virus p ....