During oobesystem configuration pass, settings are applied to Windows before Windows Welcome starts. This pass is typically used to configure Windows Shell options, create user accounts, and specify language and locale settings. This configuration pass runs because by default the sysprep command is run with the /OOBE option within the imaging tasks of Deployment Solution.
For additional information on Windows 7 Setup Configuration Passes http://technet.microsoft.com/en-us/library/dd744580(WS.10).aspx
Deployment Solution 6.9 SP3