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The SAM Remote Protocol (Server-to-Server) includes four sets of messages. The first set specifies messages that a domain controller (DC) sends to a primary domain controller (PDC) within the same domain to communicate select state changes in the requestor's database. The second and third sets specify messages that a read-only domain controller (RODC) forwards to a writable NC replica within the same domain to affect state changes in the responder's database. The fourth set, forwarded SAM Remote Protocol (Client-to-Server) messages, is different in that it uses a different transport protocol, as specified in [MS-SAMR].
This protocol is different from the Directory Replication Service (DRS) Remote Protocol (specified in [MS-DRSR]) in that (1) it is a "push" model from requestor to responder, and (2) it is used to communicate very limited, non-extensible, predefined state changes.
With the exception of the third set, this protocol is implemented within the Netlogon Remote Protocol [MS-NRPC] and requires that a Netlogon session be established between the requestor and the responder.