how do they work??? what do you need to get one? and are they legal?

A remote desktop system lets you control a computer you are not at. They are completely legal, and are very useful for when you need to access something on your home computer but you're not at it.

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how do you get one? is it a program or router, or is it done through the internet?

It's program based. XP Pro has a built-in one, but for simplicity, I use and suggest LogMeIn: http://www.logmein.com.
You don't need to install any software on the computer you connect *from*, and it's very easy to set up on your own computer, too. Don't let all the prices fool you - the basic service is free. You might be given a free trial of the Pro version, though

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Thanks,
Ash
CF Founder
Great Webhosting. Shared starting at $2 per month. VPSes starting at $6 per month.
www.Centicero.com
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wow, cool thats really helpful! yet again, ash comes to the rescue!