Macbook pro 13" OSX Mavericks F3-Key Function? Whats this F3 on the Macbook pro 13" with MacOs Mavericks on it? If I press it, there is my desktop big and above from it, my open programs with thumbnail. But this is feature is senseless, because from there I cant switch through my programs with shortcuts.

Greetings.
That is called "Mission Control"

If you prefer to use the keyboard rather than the mouse to switch to a different workspace, you can use control + &#x2190; or control + &#x2192;