Acer Veriton 6900Pro - Manual (Page 39)

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Volume control/mute keys
Lock keys
The keyboard has three lock keys which you can toggle on and off to switch
between functions.
Note: Scroll Lock may not work with some applications.
Icon Key Description
Volume up Press to increase audio volume.
Volume down Press to decrease audio volume.
Mute Toggle sound on/off.
Lock key Description
e (Scroll Lock) When "e" is activated, press to run Acer Empowering
Technology.
When "Scroll Lock" is activated, the screen moves one line up
or down when you press the up arrow or down arrow,
respectively.
Num Lock When activated, the keypad is set to numeric mode, i.e., the
keys function as a calculator (complete with arithmetic
operators such as +, -, * and /).
Caps Lock When activated, all alphabetic characters typed appear in
uppercase (same function as pressing Shift + ).