> There is an internationalized version of troff in Plan-9, as described
> here (this paper was typeset by that verison of troff too):
> 
> 	http://www.cs.bell-labs.com/sys/doc/utf.ps
> 	http://www.cs.bell-labs.com/sys/doc/utf.pdf
> 	http://www.cs.bell-labs.com/sys/doc/utf.html
> 
> Plan-9 source code is supposedly now somewhat freely redistributable.

Internationalization of typesetting is more than a charset issue.  I
can't believe Plan-9 troff knows Japanese typesetting rules...

Masao