How to Close All Windows in a Windows 7 Grouped Taskbar Icon
Information
This will show you how to Close all windows in a grouped taskbar icon all at once in Windows 7. This will not work if you do not have taskbar grouping enabled.
Here's How:
1. Press and hold Shift and right click on the grouped icon that you want to close all of it's grouped windows all at once for, then click on Close all windows.