The Windows taskbar is one of the most important parts of the Windows 7 and Windows 8 user experience and customizing it to your specific needs will go a long way in making Windows easier to use.
A feature of Windows 7 is that it will show you a preview, or small thumbnail image, of the open windows for a particular program when you hover over it. For example, if you have 3 Internet Explorer ...
Although Windows 11 shows icons in an Overflow menu on the Taskbar, it is possible to stack or unstack icons on the Taskbar using this tutorial. You can do that with the help of the Registry Editor.