Apple 17-inch MacBook Pro (User’s Guide) - Manual (Page 101)

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Specifications
You can use System Profiler to find out detailed
information about your MacBook Pro.
You can find out the amount of built-in memory, hard disk size, devices connected,
the product serial number, and more. To access the information in System Profiler,
choose Apple () > About This Mac from the menu bar and then click More Info,
or open System Profiler, located in /Applications/Utilities/.
Click the triangles in the window
to show and hide information in
the different categories.