VMS Help SET, ENTRY, Parameter  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 entry-number[,...]

    Specifies the entry number of the job you want to change. If
    you specify more than one entry, separate the entry numbers with
    commas (,).

    The system assigns a unique entry number to each queued print
    or batch job in the system. By default, the PRINT and SUBMIT
    commands display the entry number when they successfully queue
    a job for processing. These commands also create or update the
    local symbol $ENTRY to reflect the entry number of the most
    recently queued job. To find a job's entry number, enter the
    SHOW ENTRY or the SHOW QUEUE command.