The following is from MSDN for SQL Server 2012. Please read the information at the top of the page.
http://msdn.microsoft.com/en-us/library/ms151718.aspx
I just want you to be aware that this feature is being deprecated and will be removed from a future version of SQL Server. If you are just now looking at implementing this, you may want to revisit what you are trying to accomplish and see if something like peer to peer transactional replication will provide the same functionality.
http://msdn.microsoft.com/en-us/library/ms151196.aspx