APPLICATION SWITCHER

Turning on application switching lets one hot key toggle between open programs. A hot key can be choosen in the CopyPaste preferences. To use it, hold down the hot key and select a program from the list with mouse or arrow keys. Repeating the hot key cycles through the open applications. 

Below the icon you can see info about the allocated memory "Size" (You set this in the Finder's Information window) and the unused amount of this allocated (Free) memory.

The following commands work in the Application Switcher:
• Type "Q" to quit a program via Apple Events. You can quit "background only" processes and even the Finder to free memory by typing "Q"
• Type "I" to see process information (for programmers)
• Type "H" to hide all windows of other programs. This is permanent until you type "H" again later. (you can set this in the preferences as well)
• Type "A" (=show All) to show background processes along with the other programs.
• If you choose "ctrl" as your hot key, then typing "I" does not work anymore: this is because the System interprets ctrl + I as the tab key, which only lets you cycle forward.