The oobeSystem pass configures settings that are applied during the first-boot experience for end users, also called Windows Welcome. oobeSystem settings are processed before a user first logs into Windows.
Out-of-Box-Experience (OOBE) runs the first time the user starts a new computer. OOBE runs before the Windows shell or any additional software runs, and performs a small set of tasks necessary to configure and run Windows.
You can configure Windows to boot to Windows Welcome by running
sysprep /oobe. By default, after running Windows Setup, Windows Welcome starts.