It switches between open applications.
Brad Graziadio created ALT+TAB. He is also my father.
Alt Tab is a more basic way of changing from one task to another, the Windows + Tab gives a preview of the task you are potentially going to change to, you can select other tasks, by holding the windows key whilst tapping the Tab key
The CTRL key is the only difference. What it actually does depends on the currently active program and/or control, and whether or not the key combo has been implemented or not. If not, the shell processes the key combo. On my system (Windows 7), both combos bring up the task switcher.
Alt-Tab Hold down the alt key like a shift key, press tab a number of times until you see the application you want. one quick alt tab takes you to the last application used.
CTRL+ALT+TAB on most windows 7 machines stays even when you stop pressing key and wait for confirmation of windows selection. ALT+TAB switches instantly and is not waiting for confirm (mouse click on icon or RETURN key);
alt+tab
If you are using Windows operating system, then hold "Alt" and hit "Tab". In W7 and Vista, you can use "Windows special key" and "Tab" WIN+TAB or ALT+TAB
Alt-Tab. Pressing Alt-Tab, and holding the Alt key will bring up a window, showing all of the windows you have opened. To select one, tap Tab until it is highlighted, and release Alt.
alt+tab
Alt+Tab
You can Hold the Alt key while pressing tab (Alt+Tab) to flip through the running windows.
Alt + Tab usually works in Windows and Linux.