Sony PCG-GR300K - Manual (Page 7)

Indicator lights
Light On Off
Num Lock The number keys in the numeric keypad are active. The
alphanumeric character keys in the keypad area are active.
Caps Lock The letters appear in uppercase as you type. The Shift key lowers
the case of typed letters when Caps Lock is on. Letters appear in lower case as you type (unless you hold down
the Shift key).
Scroll Lock The screen scrolls differently. (Exactly how it scrolls depends on
the specific application. It has no effect in many applications.) Information moves across the display normally.
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