How do you connect device to PC?

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http://androidforums.com – I am trying to attach a Samsung phone to my PC to test my android apps. I am using Eclipse and have the emulator working ok. I have downloaded the driver for my phone to my computer. I have enabled the settings on my phone in order to allow testing on my phone. One thing that is not working according to documentation that I have read is that if I run 'adb device' in the command prompt, my device does not show up. So I am wondering why my device is not visible in the list. Is it because I have not installed the driver in the correct location? And is this why I am not able to connect my (General)