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

       /DESTINATION=device-name:[directory-name]

    If /FORMAT=SEQUENTIAL is specified, /DESTINATION specifies
    the directory where the utility creates the sequential kit. A
    sequential kit is a container file that includes the PDF, PTF,
    and all the images and other material that make up the product.
    The file type of the sequential kit file is .PCSI.

    If /FORMAT=REFERENCE is specifed (or defaulted), /DESTINATION
    specifies the directory where the utility creates the output
    PDF file and optional PTF file. The file types of the PDF and
    PTF files are .PCSI$DESCRIPTION and .PCSI$TLB, respectively. The
    images and other materials that make up the product are placed in
    a directory tree under this directory.

    If the device name is not provided, it defaults to the user's
    default device. If the directory name is omitted, it defaults to
    the user's default directory.

    The PRODUCT PACKAGE operation ignores the PCSI$DESTINATION
    logical name whether or not you use the /DESTINATION qualifier.