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Infecting Bulletin Boards

The popularity of electronic bulletin boards and the availability of public domain software is another way that contaminated software spreads. If you become infected through contact with contaminated public domain software, the virus can be passed to other users who are in contact with you. A virus can propagate by reading the electronic mail distribution lists of the victim and sending itself to everyone on the lists. You do not have to exchange diskettes or CDs for a virus to attack your PC. Just participating in a network with other machines can do it.