Acer Extensa 4100 - Manual (Page 24)

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English
Using the keyboard
The keyboard has full-sized keys and an embedded keypad, separate
cursor keys, two Windows keys and twelve function keys
.
Lock keys
The keyboard has three lock keys which you can toggle on and off.
Lock Key Description
Caps Lock When Caps Lock is on, all alphabetic characters typed are in
uppercase.
Num Lock
(Fn-F11) 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.
Scroll Lock
(Fn-F12) 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.