It is fairly easy to hack a computer (I have not done it). There are alot of holes in the Windows OS (other OS's as well), that can be exploited by an attacker to gain access to your computer. Once they have access, they will be able to do what they wish your PC. I read in the summer about 'bot nets'. Basically what a 'bot net' is, is a bunch of hacked PC's, and have a backdoor installed on them. The hacked PC then connects to an IRC channel, where they are given commands from a person. Its like having your own electronic army.
Once a bot net has been established, basically they can do what ever they want:
ie: Flood a server for extorsion purposes, send out spam, etc. Alot of the time, they can just be used to flood rival groups and such.
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