Blank Button on iPad keyboard dock

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iPad Guide Junior Member
Joined: 02/08/2010
Posts: 30
Blank Button on iPad keyboard dock

The button to the right of the keyboard toggle and to the left of the rewind button on the top of the keyboard dock is empty.
If you think I edited the photo, take a look at the keyboard on the device guide on this website. It also has that button as a blank one.
Anyone know what it's function is?

Image: