You can use Admintool to define remote systems that you want to access. Using Admintool to add a host enables you to log in remotely to another system by using its host name. (Without an entry in the /etc/hosts file, you would have to log in remotely to another system by using its IP address.)
If you use the Admintool to add a host to your local system and your site uses a network name service such as NIS or NIS+, Admintool host operations may not have the desired effect. This is because information in the network name service will take precedence over the information in the local /etc/hosts file, which is where Admintool updates information. If you want your Admintool operation to take precedence over information in the network name service database, see your system administrator.