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

       /SPOOLED[=(queue-name[:],intermediate-disk-name[:])]
       /NOSPOOLED

    Controls whether files are spooled to an intermediate disk.

    The queue name indicates the printer queue to which a file is
    queued. If a queue name is not supplied, the default is the name
    of either the printer or terminal.

    The intermediate disk name identifies the disk to which the
    spooled files are written. If the intermediate disk name is not
    supplied, the default is SYS$DISK (the current default disk). The
    intermediate disk must be mounted before files can be written to
    it.

    Once the device has been set spooled to a disk, that disk cannot
    be dismounted until the spooled device is set to /NOSPOOLED.
    All channels must be deassigned from a print device before its
    spooling characteristics can be changed. Also, the queue that is
    assigned to the device must be stopped.