The following Japanese input systems are prepared:
All of them offer a Japanese input facility using a romaji-kanji conversion method, which utilises a network conversion server. For details, refer to the manuals of each system. When building Mule you have to set up to use these systems, or they will not work.
This requires no conversion server. After loading lisp/quail/tcode, you can toggle between ASCII and T-CODE mode by C-]. (CAUTION: quail/tcode.el will soon be replaced with tc-mule.el.)
Japanese can be input with "SKK", too. SKK requires no special settings when Mule is built. It can be used both as a closed system in Mule and as a system which communicates with a dictionary server.