Task Switch - TASKSWITCHXP.EXE

This is part of Microsoft's Powertoys for Windows XP. Taskswitchxp.exe is an Alt-Tab Replacement. With this PowerToy, in addition to seeing the icon of the application window you are switching to, you will also see a preview of the page. This helps particularly when multiple sessions of an application are open.

Other powertoys available include: Open Command Windows Here, TweakUI, Power Calculator, Image Resizer, CD Slideshow Generator, Virtual Desktop Manager, Taskbar Magnifier, HTML Slide Show Wizard, and Webcam Timer Shot.

As long as you're familiar with Windows XP, you'll find these both useful and cool. More information and downloads can be found at Microsoft's Powertoys Site.

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Microsoft.com