Source code, database question

Hi, I have a few questions about the software.  Sorry if my questions don't make a lot of sense, I am sort of new at this.
 
1.  Do you provide full source code, and what language is the code behind written in?
2.  How much control do I have over the site registration, I already have registration set up for my site, if my users sign up through my system, can they then go and edit their profile for the forum on your page?  I have my own set of values for the user profile set up (actually for their car's profile) so I just want to make sure your profile page can access the same database.  I am a little unclear on how this works, can I just add your additional tables to my database for all the various profile settings?  I really just want to make sure I have full control of the SQL statements and can modify the database/tables as necessary. 
3.  How do your updates work, I would like an easy migration to future versions down the road.
 
Thanks. 

Thanks for your message. Let me answer your Q's one by one:

1. Source code for Pages, Master Pages, and User Controls and their respective code behind files (.vb) are available. SQL stored procedures codes are available too. The language of choice is VB.NET (ASP.NET 3.5). There are 2 dlls whose source code we don't provide -> utilities, base classes, and server controls (no need to change otherwise breaks the software).
   
   You can easily customize the software through our user control template system.
2. Yes, you can modify database / tables as well as stored procedures freely. Our profile page by default reads only from our own database unless you modify the retrieval and updating stored proc. What you can do is you can set up your page to also update our table when your users update their profiles on your site.
3. Update involves uploading files and updating database through a web based system we provide.

Thanks for the response, that sounds great.