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Get it, then you know it
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Do you want to control your computer?
Do you want to do what you want to do by your Mobil?
Do you want to download/upload file from your computer?
Do you want to play movie/music from your computer?
Do you want to move your computers mouse?
Do you want to input words to your computer?
Do you want to shutdown/restart/sleep/login off your computer?
Do you want to control PPT?
...
OK. Lets do it.