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By default, all necessary fonts and software are installed in Windows Vista (2007) or later. To input Japanese on a non-Japanese version of the OS, however, the Japanese input method editor must be enabled from the Language & region (Windows 11), Language (Windows 10), Region and Language (Windows 7 and 8) or Regional and Language Options (Vista) section of the Control Panel.
Microsoft's Shift JIS variant is known simply as "Code page 932" on Microsoft Windows, however this is ambiguous as IBM's code page 932, while also a Shift JIS variant, lacks the NEC and NEC-selected double-byte vendor extensions which are present in Microsoft's variant (although both include the IBM extensions) and preserves the 1978 ordering of JIS X 0208.
Since all Japanese characters occupy the space of a square box, it is sometimes desirable to input Roman characters in the same square form in order to preserve the grid layout of the text. These Roman characters that have been fitted to a square character cell are called fullwidth, while the normal ones are called halfwidth.
JIS X 0201, the Japanese version of ISO 646 containing the base 7-bit ASCII characters (with some modifications) and 64 half-width katakana characters. JIS X 0208 , the most common kanji character set containing 6,879 characters, including 6,355 kanji and 524 other characters (one 94 by 94 plane)
Language input keys, which are usually found on Japanese and Korean keyboards, are keys designed to translate letters using an input method editor (IME). On non-Japanese or Korean keyboard layouts using an IME, these functions can usually be reproduced via hotkeys, though not always directly corresponding to the behavior of these keys.
The early JIS draft mapped small katakana characters next to each of their normal katakana characters. It was considered to be convenient for sorting by Gojūon order (JIS X 0208:1978 chose this ordering). Some committee members criticized it would complicate the mechanic of keyboards which only handled normal katakana characters.
Shift JIS is an extension of the single-byte encoding JIS X 0201:1997, that uses unassigned code points in JIS X 0201 to encode the double-byte JIS X 0208:1997 character set. The lead bytes for the double-byte characters are "shifted" around the 64 halfwidth katakana characters in the single-byte range 0xA1 to 0xDF.
The kanji set, graphic character set for Latin characters, and JIS X 0201's graphic character set for katakana can be used together as specified in JIS X 0208 (the shift-coded character set; i.e. Shift JIS). The kanji set and graphic character set for katakana can be used together in EUC-JP.