Matt,
Click on my name and send me an email and we can set up a demo.
Active Directory is a database, so the web service queries it directly and loads the fields right into your form for its use. It does not copy it to an additional SQL table. So when the form opens it queries AD and returns the user's username, which you can use to filter specific content or query for all AD information such as email address, manager, etc.. You also can check for group membership.
Then you use the username to do a lookup on your other data and automatically display them. We use it all the time for security and audit tracking. Another great thing is that this works over VPN and RAS and gets the user's network authentication not their local user account.