Usage
You can enter this command from a session, a job, a program, or in
break mode. Pressing Break does not affect this command
if a welcome file is used; otherwise, Break aborts the command
and leaves the welcome message unchanged. You can only
enter this command from the console; however,
you can enter this command from your terminal if
your system administrator has used the ALLOW
command to enable you to enter the WELCOME command.
You do not have to reboot the system after entering this
command.