Problems
If Num Lock is disabled, attempting an Alt code may cause unexpected results in some applications. For example, Alt+4 can be taken as Alt+←, causing a web browser to go back one page.
Many laptops do not have a separate numeric keypad; however, the Fn key can be used to turn certain keys into a numeric keypad. There usually is a key called Num lock to "shift" certain keys to act as if they were the numeric keypad keys. For example, on keyboards where there is no dedicated num-pad (mostly found on small-medium laptops and netbooks), the following scheme is very common:
| 7 | 8 | 9 | 0 |
| U | I | O | P |
| J | K | L | Ñ |
| M | , | . | - |
Read more about this topic: Alt Code
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