Lol, a RAT stands for Remote Administration Tool, it's basically a trojan horse/virus, with built in commands to control like EVERYTHING on your PC from somewhere else,
I use them on my computers and it works great, I wont post a link because quite a few are illegal,
check out
http://prorat.net
that's a legit one too.
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I am 66% addicted to Counterstrike.
What about you?