Acer Aspire 7520 - Manual (Page 49)

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Using the keyboard
The keyboard has full-sized keys, separate numeric keypad, cursor, lock,
Windows, function and special keys.
Lock keys and separate numeric keypad
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 When Num Lock is on, the separate 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.
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.