Apple iPad For iOS 4.3 - Manual (Page 177)

Japanese
You can enter Japanese using the Romaji keyboard or Fifty Key keyboard.
Entering Japanese Romaji
Use the Romaji keyboard to enter syllables. Alternative choices appear along the top of
the keyboard; tap one to enter it.
Entering Japanese Fifty Key
Use the Fifty Key keyboard to input code for Japanese syllables. As you type, suggested
syllables appear. Tap the syllable to choose it.
Korean
Use the 2-Set Korean keyboard to type Hangul letters. To type double consonants or
compound vowels, touch and hold the letter, then slide to choose the double letter.
Vietnamese
Touch and hold a character to see the available diacritical marks, then slide to choose
the one you want.
You can also type the following key sequences to enter characters with diacritical marks:
 aa—â (a circumflex)
aw
 —ă (a caron)
 ee—ê (e circumflex)
 oo—ô (o circumflex)
ow
 —ơ (o hook)
w  —ư (u hook)
dd  —đ (d dash)
 as—á (a acute)
af
В —а (a grave)
 ar—ả (a question mark)
ax
В —г (a rising accent)
aj  —ạ (a drop tone)
177 Appendix B International Keyboards