numpad4tabletlinux Wiki
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The numpad_rc01 version works quite well, but there are some features still to be implemented.

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.
It is possible to write a word that is not in the dictionary simply toggling the button "New Word": predictive mode will be deactivated and the new word will be added to the dictionary after you sent it to the focused window.