These are thumbnails of a set of single-app stacked windows in the Taskbar.
Hover over each thumbnail to find the right one.
By tweaking the Windows Registry, you can change the stacked window behavior in the Taskbar to automatically open the last active window of that particular application.This blog post is also available in PDF format in a TechRepublic download.
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Registry EditWarning: The Windows Registry is an integral part of the Windows 7 operating system. Editing and changing the registry file could render the system inoperable. Please make a backup of the registry file before you make any edits or tweaks. Click the Start button and enter regedit in the search box and then click the regedit.exe menu item. Answer the UAC prompt to get to the edit screen (Figure C). Navigate to this key:
Find the right key.Right-click in a blank area in the right pane, click New, and then click the DWORD (32-bit) Value menu item, as shown in Figure D.
Create a new DWORD.Change the name to LastActiveClick, as shown in Figure E.
Change the name to LastActiveClick.Double-click on LastActiveClick to open the Value dialog box and change the Value Data field to 1 and click OK, as shown in Figure F.
Change the Value Data field to 1.
Exit out of regedit and restart Windows. Now, when you click the icon representing stacked windows of a single application, you will automatically be sent to the last active window. If you click the stacked windows icon again, the next to last active window will be brought to the forefront and so on. No more thumbnails to choose from.
Mark Kaelin is a CBS Interactive Senior Editor for TechRepublic. He is the host for the Microsoft Windows and Office blog, the Google in the Enterprise blog, the Five Apps blog and the Big Data Analytics blog.