CJKOS(Chinese, Japanese, Korean Operation System) is used to enhance the English version of PalmOS to become a multi-language system, supporting Chinese, Japanese and Korean. CJKOS supports displaying Chinese, Japanese and Korean words. CJKOS will intelligently identify and display simultaneously both Simplified (GB-2312) and Traditional (BIG-5) Chinese words, EUC-JIS and Shift-JIS Japanese words, and Korean KSC-5601. Localizer supports a native-language interface for PalmOS. CJKOS supports the input of Chinese words: CangJie, HongKong CangJie, Easy, ZhuYin, Cantonese; Japanese Hiragana and Katakana; Korean Word, Icon Word. Various fonts are supported. CJKOS supports external keyboard and JogDial. Version 4.5 features: support of ARM-based Palm OS 5; support Palm Tungsten T, Zire 71, Tungsten C; support of SONY CLIE PEG-NX70V/U, PEG-NZ90/U, PEG-TG50/H, PEG-TG50/J; on ARM-based Palm OS 5, fonts can be put into VFS expansion cards; support of 2 beol-sik Korean Input Method offered by Sung-ho Han; fixed the messy screen on Agendus; other revisions.