Library /sys$common/syshlp/mailhelp.hlb PRINT, Qualifiers, /HOLD  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /HOLD
       /NOHOLD

    Controls whether the message is available for print immediately.
    The print job is not released for actual printing until you use
    the DCL command SET QUEUE/ENTRY/RELEASE to release it.