Lenovo ThinkPad 770E-ED, Reference

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System-Status Indicators
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The numeric lock indicator indicates that the numeric keypad
function is enabled. Press and hold the Shift key while pressing the
NumLk key to enable or disable this function.
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The caps lock indicator indicates that the caps lock mode is
enabled. This mode enables you to enter the alphabetic characters
(
A–Z) in capital letters without using the Shift key. The Caps Lock
key enables and disables this mode.
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The scroll lock indicator indicates that the scroll lock function is
enabled. This function enables you to use the Arrow keys to scroll
the screen. However, you will not be able to move the cursor with
these keys when this function is enabled. The ScrLk key enables
and disables this function. Not all application programs support this
function.
Chapter 1. Getting Familiar with Your Computer
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