Visually Impaired Attendant Service (vis). Activates visually impaired
service for the attendant. When this service is activated, the attendant
can listen to console status or messages by pressing buttons that have
been translated as follows:
• “con-stat” repeats the console status.
• “display” calls out display contents.
• “dtgs-stat” calls out the DTGS status.
• “last-mess” repeats the last message.
• “last-op” calls out the last operation