[PERFORM] Nls sorting in Postgresql-8.3.3

[Praveen]

Hello,
I installed postgresql-8.3.3 in our local server  with option  --enable-nls . 
After successful installion , I create database and import data.But I am not 
aware how to use nls sort in this postgresql-8.3.3 .
Please tell me  syntax how to use nls sort in query , if some one know.
Thanks in advance.
Praveen Malik.