VMS Help SET, HOST, /LAT, Qualifiers, /QUEUE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /QUEUE
       /NOQUEUE (default)

    When connecting to a reverse LAT service that is already in use
    (such as a dial out modem), you are notified that the service
    is in use and the SET HOST/LAT command terminates. However, LAT
    can allow incoming connections to be queued to any reverse LAT
    service that supports service queueing, which enables users to be
    placed on a queue when using reverse LAT services.

    LAT reports your position in the queue. When the resource becomes
    available, you are immediately notified. You can cancel the
    queued connection by pressing Ctrl/Y and terminating the SET
    HOST /LAT command.