/sys$common/syshlp/helplib.hlb SYNCHRONIZE, Qualifiers, /ENTRY  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /ENTRY=entry-number

    Identifies the job by the system-assigned entry number.

    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 SHOW QUEUE command. If you specify both the job-name
    parameter and the /ENTRY qualifier, the job name is ignored.