wp_magic.php

<?php
/* Place in /wp-content/ */

include('../wp-config.php');
include('../wp-load.php');
global $wpdb;

//Settings
$type = 0; //1 for post, everything else for pages
$category_id = 1; // ID of the category, or...
$parent_id = 2; // ID of the page
$write_panel_id = 3;  // ID of the Write Panel

if ($type == 1) { //For posts

	$add = new WP_Query('cat='.$category_id);
	if ($add->have_posts()) {
		while ($add->have_posts()) {
			$add->the_post(); 
			update_post_meta($post->ID, "_mf_write_panel_id", $write_panel_id);
			echo $post->post_title.'<br/>';
		}
	}

} else { //For pages and their children

	$qry = "SELECT ID, post_title, post_parent FROM " . $wpdb->posts . 
		" WHERE post_parent='" . $parent_id . "'";
  	$posts = $wpdb->get_results( $qry );
	
	foreach( $posts as $post ) {
		update_post_meta($post->ID, "_mf_write_panel_id", $write_panel_id);
		echo $post->post_title.'<br/>';
	}
}

/* Live long and prosper */
?>