Ennis posted 'The Ultimate Newbie FAQ'. In there he had something about Trojans:

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The Trojan:
Trojans consist of a server and a program. The server is sent ot your victim which must be executed and then you can gain access to their computer. Simple but so lame.
Only script kiddies would use trojans and I advise any self-respecting human not to use these things...
To avoid getting a trojan on your PC, watch what you are downloading and get a virus scanner.
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You can get his entire post here:
http://www.antionline.com/showthread...093#post449436

Greg