If you’re running a number of files from the same program, such as multiple documents in Microsoft Word, Windows 7 allows you to switch through these windows with ease.

Simply press down on the Ctrl key while clicking the icon from the taskbar.

Each click will change the window to the next in the sequence, in the order that you opened them.

User might doubt that: "Why we need to press the Ctrl key instead of just click?", well, the answer is: by just only click on each minized windows of the same category items, the clicked item's windows will be minimized down to the taskbar, but with the Ctrl key, no minimization event occur.