JumpControl is a free portable tool created by ProtoSphere at deviantART that allows you to shutdown, restart, sleep, switch user, lock & log off directly from your taskbar in Windows 7.
How to use:
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Download the app and extract the zip archive.
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Right-click on the app and select Pin to Taskbar.
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Select the items that you want to use and close the tool.
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Now whenever you want to shut down, restart, sleep, switch user, lock or log off, just right-click its icon and select the desired option.