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Trojans are "back doors" into a system. A hacker may disguise a trojan as another program, or
game, in order to 'trick' a user into installing it on their system. The most famous of these trojans to date is probably Back Orifice by the Cult of the Dead Cow. This trojan was believed to have infected thousands of computers around the world.
Once installed, a hacker may have access to all of the files on your hard drive, be able to delete or create files, open your cd-rom drive, reboot your computer, make pop-up messages appear, or do any other host of things.
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