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WUA running context used to install update

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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