Sony PCG-TR2MP Hardware Manual page 27

Using your VAIO computer
Light
Hard disk
Num Lock
Caps Lock
Scroll Lock
On
Data is read from or written to the hard drive.
Turns on when the number keys in the numeric
keypad are active.
Turns on when the letters appear in uppercase as
you type. The <Shift> key lowers the case of typed
characters when Caps Lock is on.
Turns on when the screen scrolls differently (Not all
applications support this function).
Off
The hard drive is not being accessed.
Turns off when the alphanumeric character keys in
the keypad area are active.
Turns off when the letters appear in lowercase as
you type (unless you hold down the <Shift> key).
Turns off when the information moves across the
display normally.
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