Windows 8 - http://windows.microsoft.com/en-AU/windows-8/power-plans-faq
Windows 7 - http://windows.microsoft.com/en-au/windows7/power-plans-frequently-asked-questions
Vista - http://msdn.microsoft.com/en-us/library/ms700612(v=vs.85).aspx
Windows XP - http://windows.microsoft.com/en-AU/windows-xp/help/setup/configure-power-management
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