The user interface is based on an interactive command interpreter that gives you access to an extensive set of functions for hardware and software development, fault isolation, and debugging. Any level of users can use these functions.
The user interface prompt is implementation dependent.
You can enter the OpenBoot environment in the following ways:
By halting the operating system
By pressing the Stop-A key
By power-cycling the system
If your system is not configured to boot automatically, the system will stop at the user interface.
If automatic booting is configured, you can make the system stop at the user interface by pressing the Stop-A keys from the keyboard after the display console banner is displayedbut before the system starts booting the operating system.
When the system hardware detects an error from which it cannot recover (This is known as a Watchdog Reset.)
See "A Caution About Using Some OpenBoot Commands" for information on using commands after entering OpenBoot from the operating system.