To login to the remote system iona using the same username:
rlogin iona Password:
This logs the user in to their account on the remote system named iona. Their username on this sytem is identical to their username on the system they are currently using.
To login to the remote system barra using the username helper:
rlogin barra -l helper Password:
This logs the user in to the remote system named barra on which they have an account for the username helper. This username is different to their username on the system they are currently logged in to.