A series of links to
SQL Server articles and documents
Books online for Microsoft SQL Server 2012
Task descriptions and reference documentation that describes how to perform data management and business intelligence work by using Microsoft SQL Server.
Using Registered Servers to Manage Servers
Registered Servers (Microsoft doc)
Enables the management of many servers. Used for organizing frequently accessed servers. Many servers can be queried simultaneously. Caution must be exercised when executing queries as they will be executed on all serves to which to are connected (check the status bar in SSMS).