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

    Prevents jobs from being entered in the queue through PRINT
    or SUBMIT commands or as a result of requeue operations. To
    allow jobs to be entered, use the /OPEN qualifier. Whether a
    queue accepts or rejects new job entries is independent of the
    queue's state (such as paused, stopped, or stalled). When a queue
    is marked closed, jobs executing continue to execute and jobs
    pending in the queue continue to be candidates for execution.