There are two popular approaches
You either setup central authentication (ldap, nis). NIS/NIS+ is an option, but they're kind of challenge to setup and going while centralized (LDAP/Kerberos/SMB/etc.) authentication is a much much better idea.
You setup a configuration management system (puppet,chef,cfengine, shell script) to automatically create accounts, and configure the environment on all your managed systems.
Central authentication systems are good when all the systems are all under the control of the same organization. It tends to be necessary when you have lots of users, and when will need to use the authentication for many things behind just logging in.
The configuration management way is good if you generally just need to setup a small number of remote admin accounts, and service accounts.
Also, refer to - Password Synchronization on UNIX and Linux
MANAGING PASSWORD SYNCHRONIZATION
A Unix/Linux specialist Administrator would be a better person to answer and implement than a pure Baan/LN Administrator.