Dell Latitude E6540 Keyboard useless button?

Zappper72

Estimable
Aug 12, 2014
2
0
4,510
Okay help me out here, above the touchpad there are 3 additional buttons (left and right click, but there is also a middle button that I have no idea what it does)

I tried clicking it, in different applications but it doesn't do anything. Any ideas would be helpful

Attached is a picture of the keyboard I found online: http://www.raqwe.com/wp-content/uploads/2013/08/review-dell-latitude-e6540-raqwe.com-02.jpg

Its on the same line where the words Dell Latitude E6540 are... you can physically press the button

Thanks