One common task is to copy a database (or move) from one instance/server to another. This is used extensively by admins worldwide whenever they take a backup of production and deploy it to a test or development server or whenever they implement disaster recovery techniques like database mirroring, log shipping, or transactional replication. This series helps you understand the core architecture of SQL Server's login system - while showing you the common problems you face in your need to synchronize logins across multiple SQL Servers.