In this post, Mark will cover the motivations behind UAC's technologies, revisit the relationship between UAC and security, describe the two new modes, and explain how exactly auto-elevation works.

Note that the information in this post reflects the behavior of the Windows 7 release candidate, which is different in several ways from the beta. Some of the operations in Windows 7 that can now be performed by standard users, but as the E7 blog post on UAC explains, we also recognized that we could make the Windows experience smoother without sacrificing UAC's goals. Many users complained about the fact that Windows Vista itself frequently asks for administrative rights when they perform common system management operations. It's in our best interest, because it's in the interest of our customers, to make Windows work well for standard user environments. However, elevation prompts don't educate or encourage us to do so, but they do force users to click a second time through a dialog that the vast majority of users don't read. Windows 7, therefore, set out to minimize those prompts from the default Windows experience and enable users that run as administrators to control their prompting experience.

Source: http://technet.microsoft.com/en-us/magazine/2009.07.uac.aspx

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