Clarification on my part when I look

When setting up a new multi site network and then initially installing the multi-DB plug-in and updating all the settings within the multi-db plug-in and within db-config-sample-256.php example on line 296 and below, it has this code
add_db_server('vip1', 'dc1', 1, 1,'64.120.23.72','192.168.0.101', 'wpmu_vip_1', 'db_user_name', 'db_user_name_pass');
//------------------------------------------------------------------------//
//---VIP Blogs------------------------------------------------------------//
//------------------------------------------------------------------------//
// Usage: add_vip_blog(BLOG_ID, DS)
// EX: add_vip_blog(1, 'vip1');

add_vip_blog(1, 'vip1');
?>
My question is when the multi-site is set up, there is a direct connection with
add_db_server('vip1', 'dc1', 1, 1,'64.120.23.72','192.168.0.101', 'wpmu_vip_1', 'db_user_name', 'db_user_name_pass');

and ,

add_vip_blog(1, 'vip1'); , correct.
When the site is set-up, which blog/site within the multisite network will I know the vip database is connected with. How could you explain that to me, so I may better understand how this works