numpad4tabletlinux Wiki
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Setting up a word is easy and evident cause the usage it is not different from mobile phone's one. You can switch words with the same code by the corresponding button. Numpad will append letters to the current typed word until it finds an already known word (i.e. an existing numeric sequence in the dictionary)
It is possible to write a word that is not in the dictionary simply toggling the button "Manual"(the button with the little pencil): predictive mode will be deactivated and the new word will be added to the dictionary after you sent it to the focused window.
Note that words containing numbers, symbols or punctuation won't be saved