Acer Aspire 1520 User Guide
The keyboard features full-size keys with an embedded keypad,
separate cursor control keys, two Windows keys, and twelve function
keys (hot keys).
The keyboard has three lock keys which you can toggle on and off.
When Caps Lock is on, all alphabetic characters typed are in
When Num Lock is on, the embedded keypad is in numeric
mode. The keys function as a calculator (complete with the
arithmetic operators +, -, *, and /). Use this mode when you
need to do a lot of numeric data entry. A better solution
would be to connect an external keypad.
When Scroll Lock is on, the screen moves one line up or down
when you press the up or down arrow keys respectively.
Scroll Lock does not work with some applications.