VMS Help PCA, Qualifiers, /INTERFACE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /INTERFACE=[interface-type]

    Controls the display interface to be selected.

    The default qualifier value is /INTERFACE=CHARACTER_CELL.

    Qualifier Keyword  Description

    CHARACTER_CELL     Selects the character cell interface.
    DECWINDOWS         Selects the DECwindows (a.k.a Motif)
                       interface, depending on the setting of the
                       various PCA*$DEC$DISPLAY and DECW$DISPLAY
                       logicals.
    MOTIF              Selects the Motif (a.k.a DECwindows)
                       interface, depending on the setting of the
                       various PCA*$DEC$DISPLAY and DECW$DISPLAY
                       logicals.