Display entries by category: modify my script

Hi there, I have a script that I’m using to display specific entries by #ID works like a charm….
<?php
/* Don't remove this line. */
$blog = 1;
if (!isset($p)) {
$p = 4;
}
require('../wp/wp-blog-header.php');
?>
Is there a way that I can modify it to display all the entries( or a certain # of entries) of one category, say for a category named “articles”
TIA
lok