Dell Inspiron 1721 (Mid 2007) - Manual (Page 24)

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About Your Computer
D ELL ™ M EDIA D IRECT ™ BUTTON — Press the Dell MediaDirect button to launch
Dell MediaDirect (see "Using Dell MediaDirect™" on page 59).
KEYBOARD STATUS LIGHTS
The blue lights located above the keyboard indicate the following:
DIGITAL ARRAY MICROPHONES — Built-in microphone for conferencing and chat.
Turns on when the numeric keypad (Num Lock) is enabled.
Turns on when the uppercase letter (Caps Lock) function is
enabled.
Turns on when the scroll lock function is enabled.
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