Function Key Combinations - Lenovo ThinkPad T420 4236 User Manual

If the numeric keypad is enabled, press and hold Shift to use the cursor- and screen-control keys temporarily.
Note: The functions of the cursor- and screen-control keys are not printed on the keys.

Function key combinations

By setting the function keys, you can change operational features instantly. To use this function, press and
hold the Fn key (1); then press one of the function keys (2).
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User Guide