/WRITABLE=[GALAXY[=IDENT]]
       /NOWRITABLE

    Installs the file as a writable known image when you also specify
    the /SHARED qualifier. The /WRITABLE qualifier applies only to
    images with image sections that are shareable and writable. The
    /WRITABLE qualifier is automatically negated if the /NOSHARED
    qualifier is specified.

    You can use the GALAXY keyword with the /WRITABLE qualifier to
    place write shared image sections in Galaxy global sections.
    You can also use the IDENT keyword with GALAXY to include the
    image ident in the name of the Galaxy global section, so that
    multiple versions of an image can be used simultaneously in a
    Galaxy system.