You can disable the Save password check
box on the remote system login window so that users are required to
enter their passwords each time they log on to a remote system.
A system administrator can set up a remote system to prevent
users from saving their password by uncommenting the following line
in rsed.envvars. The default location for this
file on the z/OS® system is etc/rdz.
When
a user connects to a system with the option, any saved passwords for
the system are cleared and any further attempt to connect to the system
does not allow the user to save a password.