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A virus is a parasitic program written intentionally to enter a computer without a user's knowledge. The word parasitic is used because a virus attaches to files or boot sectors and replicates itself so that it can continue to spread. Most some viruses do little but replicate, but others can cause serious damage or affect program and system performance. Viruses are usually devided into two primary catagories:
- Boot Infectors: Load itself into memory on every start-up.
- Program Infectors: When an infected application is run the virus loads itself into memory.
More information on viruses, and actual virus source code, is available in the AntiCode Virus Archives for study.
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