Sontana can solve these problems: it has a virtual keyboard which allows you to click on the letters, files loaded or text pasted can be automatically decoded, Sontana can check for invalid sequences of letters in files or while typing and repair them. Built in switchable key map. On screen virtual keyboard. Adjustable size and font. Click to type without a Thai keyboard. Enter characters not available on a real keyboard. Automatically select correct coding for loaded files. Conforms to WTT Standard.