* Because kanji has over 3000 commonly used characters, they can't all be put on a keyboard. Instead, computers often use a system where words are entered in roomaji (pronounced roh mah ji, the Japanese writing system that uses western letters) or kana (either of the two phonetic Japanese character sets) and translated into kanji afterwards (i.e. via a pulldown menu).
Ano hito wa waapurobaka desu yo. Tabun "neko" o kaku koto ga dekimasen.
That guy is such a word processor idiot. He probably can't write "cat".