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One who is proficient at using or programming a computer; a computer buff.
If your standards are incredibly low, yes, SENers are hackers. But to me, being proficient means you can do just about anything if you were asked to do it. Just because you can work within an incredibly simplistic program, doesn't mean you're much of a hacker.
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One who uses programming skills to gain illegal access to a computer network or file.
This is the only definition I use, because the rest are fairly worthless. It's actually worth mentioning in conversation. Not, "95% of the teenage population can work within PS so they must be proficient hackers".
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One who enthusiastically pursues a game or sport: a weekend tennis hacker.
More worthless garbage used by people who need another catchy word.
Seriously, if you use StarForge or anything like that, it doesn't make you proficient in hacking. Maybe the people who made StarForge are, but certainly not someone who just works within it.