To control access to your system, you must maintain the physical security of your computing environment. For instance, a system that is logged in and left unattended is vulnerable to unauthorized access. An intruder can gain access to the operating system and to the network. The computer's surroundings and the computer hardware should be physically protected from unauthorized access.
You can protect a SPARC system from unauthorized access to the hardware settings. Use the eeprom command to require a password to access the PROM. For more information, see How to Require a Password for Hardware Access.