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The most elementary form of malicious code is the Trojan Horse. This kind
of programme
appears to do something useful, or at least entertaining, such as putting
up an attractive screen saver.
Like its legendary namesake, however, a Trojan horse programme conceals a
destructive purpose. While running, such a programme may destroy files or
create a "backdoor" entry point that enables an intruder to access
your system.
Trojans do not propagate themselves from one computer to another.