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I accidentally discovered that in Windows 8, if you right-click a previously connected wireless network from the Start screen interface, there's an option to show estimated data usage.

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Where's this data stored? Is it possible to fetch this via PowerShell/WMI? A use case for me would be to setup automated alerts based on data usage - I currently use Networx for a more detailed breakdown, but for a quick alert, if I can fetch the usage, the automated route would help a lot.

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I wonder why it's only estimated. –  Oliver Salzburg Jan 10 '13 at 14:23
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Network\DataUsage\W‌​lan looks related. I'm still searching. –  Bob Jan 10 '13 at 15:31
It is related, but my research shows it's purely gui related, haven't seen anything on where the actual estimate is stored. nothing on google for that reg key except one result at this time. –  BigHomie Jan 12 '13 at 21:20
@OliverSalzburg Probably they call it estimated because it may show a different number than your ISP. Possibly they're guessing at some percent overhead as well (which Windows can't measure, as its being added elsewhere) –  derobert Jan 16 '13 at 18:08
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This MSDN article is the best I could find from Microsoft: http://msdn.microsoft.com/en-us/library/windows/apps/windows.networking.connectivity.datausage.aspx. It tells you how you can call it from a program, but not where the data proper is stored. I'm not going to copy and paste it all because I don't know which language you prefer to program in.

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