Consider the following scenario:
            - You have a computer that is running Microsoft SharePoint Server together with Microsoft SQL Server 2008 R2.
 - You use a user account (User A) to install and configure a SharePoint Server farm.
 - User A makes another user (User B) a member of the Farm Administrator group.
 - User A makes User B a member of the sysadmin role of the SQL Server 2008 server that hosts the farm configuration database.
 - User B runs the Farm Configuration Wizard on a different computer, and joins that computer to the farm.