How i know my mac is 2012

Hi I recently buyed my first mac!! Im really lost in this system but every day learning new things!
I wanted to confirm if my Mac is really 2012? How i know if im runnig the new Lion system?
Sometimes I open my finder and under shared is a computer name...what does this mean and if there is any way to block it?!
Thanks for the help

To determine the version of OS X select About This Mac from the Apple menu,
Which will result in this dialog:
To determine what model you actually have open System Information in the Utilities folder. You will see displayed a Model Identifier:
If your Model Identifier is greater than MacBook Pro 8,3 then you have the newest model. For example, it may show 9,1 or better.
<Image Edited By Host>

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How i know my mac is 2012

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