Acer TravelMate 4750 - Manual (Page 23)

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Using the keyboard
The keyboard has full-sized keys and an embedded numeric keypad*, separate
cursor, lock, Windows, function and special keys.
Lock keys and embedded 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 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 
+ 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.
The embedded numeric keypad functions like a desktop numeric keypad. It is
indicated by small characters located on the upper right corner of the keycaps.
To simplify the keyboard legend, cursor-control key symbols are not printed on
the keys.
Desired access Num Lock on Num Lock off
Number keys on
embedded keypad Type numbers in a normal
manner.
Cursor-control keys
on embedded
keypad Hold while using
cursor-control keys. Hold while using
cursor-control keys.
Main keyboard keys Hold while typing
letters on embedded
keypad. Type the letters in a
normal manner.
* only for certain models