IBM 6648 User Guide - Page 46
Some models have a chassis-intrusion feature that will alert you if the cover
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If Enhanced Security is enabled and you have not set an administrator password, your computer will operate as though enhanced security is disabled. If Enhanced Security is enabled and you have set an administrator password, your computer will operate as follows: v The contents of the security EEPROM (your administrator password and startup sequence) will be protected from failure of the battery and CMOS memory. v The security EEPROM will be protected from unauthorized access because it locks after your computer is turned on and the system programs have completed their startup routine. Once it is locked, the security EEPROM cannot be read from or written to by any software application or system software until the computer is turned off and back on again. On a network, this might prevent certain functions from being performed remotely on your computer. Enhanced Security adds a hard lock for an extra measure of protection for the system programs in your computer. Normally, the entire contents of the system programs EEPROM is write protected with a soft lock. A soft lock enables the Remote Administration program to function in a network environment. With a hard lock, when your computer is turned on and the system programs startup routine is completed, Remote Administration is locked and cannot be unlocked until the computer is restarted and the administrator password is entered. Note that, in a networking environment, this prevents the system programs in your computer from being updated remotely. Someone must be present at your computer to turn it on and off and enter the administrator password. v Some models have a chassis-intrusion feature that will alert you if the cover of your computer has been opened. This feature will work if your computer is on or off. If the cover has been opened, a prompt for your administrator password will appear on your screen, and your computer will remain in a suspended state until your administrator password is entered. v Configuration settings cannot be changed in the Configuration/Setup Utility program until you enter the administrator password. This means that any changes to the computer hardware that the system programs detect will generate a configuration error until you enter the administrator password. To enable or disable Enhanced Security: 1. Update the system programs. See "Updating system programs" on page 20. 2. During the run of the system program update, you are given the option of enabling or disabling Enhanced Security. Your choice is automatically recorded in the System Security menu of the Configuration/Setup Utility program. 32 User Guide