Surface Pro 3 Pen
One-press quick note access. If you press the (purple) button on the top of the Surface Pen—even if you're signed out of Surface Pro 3 or the device is locked or asleep—OneNote will launch into a new note in Quick Notes so you can instantly capture notes.
Double-press screen capture. If you double-press the button on the top of Surface Pen while using Windows on Surface Pro 3, an overlay will appear so you can use the pen to select the area of the screen you wish to capture, or "clip". When you do so, the captured area is pasted into a new note in Quick Notes.
Find more information on Microsoft's Surface Pen page
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