Get a blog post from any site on the network. This function is the same as get_post(), except that it can retrieve a post from any site on the network, not just the current site.
<?php get_blog_post( $blog_id, $post_id ); ?>
Get the post with id 6 from site 3:
<?php $post_6 = get_blog_post( 3, 6 ); echo $post_6->post_title; ?>
get_blog_post() is located in wp-includes/ms-functions.php
.