Fujitsu LIFEBOOK T901 Série Guide D'utilisation page 34

Hard Drive/Optical Drive Access Indicator
The Hard Drive/Optical Drive Access indicator shows whether your internal hard drive or optical drive
are being accessed is being accessed
Security Indicator
The Security Indicator flashes (if a password was set) when the system resumes from Off or Sleep modes.
You must enter the password that was set in the Security Panel before your system will resume operation.
NumLk Indicator
The NumLk indicator states that the integral keyboard is set in ten-key numeric keypad mode.
CapsLock Indicator
The CapsLock indicator states that your keyboard is set to type in all capital letters.
ScrLk Indicator
The ScrLk indicator states that your scroll lock is active.
.
28 - Status Indicator Panel