The SunOS release 4 software supported single-byte representation of non-ASCII characters. The Solaris 7 operating environment supports multibyte representation. This support is needed for Asian language character sets, which contain thousands of characters.
Multibyte-to-wide character conversions
Wide character standard I/O
Wide character classification
Wide character formatting
The Solaris 7 operating environment supports multibyte file names; however, login and machine names should be restricted to ASCII characters.