Setting up iucvtty instancesEdit online Set up one or more iucvtty instances, as required. Installing iucvttyThe iucvtty program is part of the s390-tools package.Enabling user loginsDepending on your distribution, you need a systemd instance unit, an Upstart job file, or an entry in /etc/inittab to facilitate user logins.Parent topic: Setting up the target systems