Sharepoint 2010 Installation issues

Hi,

My requirement is this. I need to install a sharepoint server in a system A. Now I need to install another Sharepoint server in System B, only this time I need the config database on system A rather than System B.

In short, sharepoint in both system A and system B should have the database in the same sql server(that is either in A or B). How this can be achieved?

Thanks

Shameej