Can informix support unicode? i try to key in chinese char but it fail when i retreive it. Is there any way to configure it? or something to do with programming?

IDS 9.40 Support for Unicode
...........................

The Dynamic Server now supports Unicode 3.1.1 code points for multilingual
data via the environment variable GL_USEGLU.

By default, that is without setting GL_USEGLU, Unicode and GB18030-2000
are supported using Informix locales. In Dynamic Server version 9.40,
Unicode and GB18030-2000 can also be supported through ICU (International
Components for Unicode) by setting the GL_USEGLU environment variable to 1
before starting Dynamic Server.

Please check "ids_unix_release_notes_9.40.txt"
in $INFORMIXDIR/release/en_us/0333

Yes~