9L0-415 Web TestEngine demo

The master password is used to reset local account passwords.

A Safe Boot is initiated by holding down the Shift key during system startup

The system launchd process is ultimately responsible for starting every system process.
It also manages system initialization and starts the login window process.

The system version, build number, and hardware serial number are located in the About This Mac dialog or the login screen. The system version number defines the specific version of OS X currently installed. The system build number is an even more specific identifier used primarily by developers.
Finally, the hardware serial number is a unique number used to identify your specific Mac.