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This might be useful for 3rd-party update developers.
| Description | Context Used to Install Update | |
| Site | This is when you go to https://www.update.microsoft.com directly for updates. This is only used for pre-Vista systems |
The current user account |
| WU App | This is for Vista/Win7 system. This is when you go to Control Panel -> Windows Update |
The current user account if the update installation require UI to accept EULA; Or Local System account otherwise. |
| AU App | This is for pre-Vista system. This is when you go to Control Panel -> Automatic Update and set "download but let me choose when install" |
The current user account |
| AU App with setting | This is for pre-Vista system. This is when you go to Control Panel -> Automatic Update and set "install update automatically" |
Local System account |