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It is possible to run multiple AD LDS DCs on the same computer. All of these AD LDS DCs listen on the same RPC interface ID. So that clients can distinguish between different instances of AD LDS that are running on the same computer, each RPC endpoint is annotated (as specified in [C706]) with a string containing the LDAP port number on which the DC listens. For example, if two AD LDS DCs are running on a computer, with one listening on port 389 and the other listening on port 50000, the RPC endpoints of the AD LDS DCs are annotated with "389" and "50000", respectively.
For a client to establish an RPC connection to an AD LDS DC, the client needs to know the name of the computer and the number of the LDAP port on which the AD LDS DC is listening. First, the client establishes a connection to the endpoint mapper service on the computer. Next, the client enumerates all endpoints that are registered for the desired interface ID. Finally, the client selects the endpoint whose annotation equals the LDAP port number of the desired AD LDS DC.
AD DS DCs do not annotate their RPC endpoints. RPC endpoint annotation is not required for AD DS, because it is not possible to run multiple AD DS DCs on a computer.