The numlock is a switch-key on your keyboard located in the upper-left corner of the numeric keypad, showing "Num" and an arrow pointing downwards.

The function of the numlock is rather archaic: it let's you switch between the numeric keypad as such or as a cursor field (you did need that on older computers running a text-based OS).
If the numlock is activated, an LED above the numeric keypad labelled "Num Lock" will ignite.

Today, of course, noone needs this function anymore, since GUI's use a mouse as pointer. So, normally, the numlock should be activated.

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