What does the new command on the f4-key do? I used to have a dashboard icon, which opened the dashboard when clicked on my keyboard.

But now there is another image, which does nothing when clicked.

What is it supposed to do?

How to I fix it?

How do I alternative assign it to dashboard again?

Image: 

Also what does the key with an upward arrow and a line do?

And what does the one with a crossed box do?

Image 2:
Caret and Line is Enter, and the crossed box is clear.

http://en.wikipedia.org/wiki/Apple_Keyboard