I have always wondered how Group Policy Software Installation knows what MSIs to install when. Looking over Experts-Exchange and several forums/blogs, most made it out to be like magic.
Today, I stumbled across this article: http://technet.microsoft.com/en-us/windowsserver/cc817587.aspx
Windows 7 Power Plans control how the computer uses energy, where users can select a plan that meets their needs without having to elevate privileges. The command-line tool Powercfg.exe allows users to manage and migrate power plans between computers. In the following steps we will be using the import and export options of the Powercfg command-line utility:
By default, updated device drivers from the Windows Update repository are downloaded and installed automatically on a computer. However, if drivers are not found in the driver store then, only an administrator (user with administrative permissions) can install them. You can change this behaviour by configuring a computer Group Policy so that ordinary users can install specific drivers.