The two local users are:
Client Connection properties under the remote station’s NiagaraStation device.In theory, an LDAP user could serve as a service user, however, this is not recommended. A local service user makes the initial configuration of a NiagaraNetwork more straightforward and provides immunity from station-to-station communication issues that might arise, say from LDAP password expiration rules, or in the unlikely event of LDAP server problems.