query_posts parameter

I want to know, in wich WordPress core file, are defined the query_posts parameter list?

I want to sort the loop order by a specific field in my posts table (points).

For the moment, i can sort the loop with any of the default parameter of the query_posts function.

But if i try to sort the loop using the “points” field in my posts table: for instance here at this website

<?php if ( have_posts() ) : query_posts($query_string .’&orderby=points&order=ASC’); while ( have_posts() ) : the_post(); ?>

it doesn’t work.

anybody can help me?

maybe add a new parameter “points” to the query_posts function?

thx