Windows keyboard shortcut to toggle between the applications opened, you will have to press ALT+TAB. This was refined in Windows Vista with the Flip 3D which looked so awesome.
In Windows 7 a newer functionality is being introduced. Lets say for an example you have 4 word documents opened and minimized along with another 5 of other programs and files being opened and minimized and you want to toggle between only the word documents that are open, you can simply press and hold down the CTRL button and click on the Word icon on the taskbar.
an efficient way of toggling between programs which you really want to toggle.