2 WordPress Installs on one domain – How do I…

Hello. I have 2 WordPress installs on one domain. How do I include posts from one blog into the other blog on the same domain? I tried:

<?php

query_posts('category_name=articles&showposts=3');     

while (have_posts()) : the_post();?> 

<li class="post-<?php the_ID(); ?>"><a href="<?php the_permalink() ?>" rel="bookmark" title="<?php the_title(); ?>"><?php the_title(); ?></a><?php the_excerpt(); ?></li>

<?php endwhile; ?>

but that is only including the entries from the blog I’m currently located in. How do I pull the other blog entries and list them inside of the other blog?