(Default) Selects the specified display as the current scrolling
    display. This is the default display for the SCROLL, MOVE,
    and EXPAND commands. Although any display can have the scroll
    attribute, you can use only the MOVE and EXPAND commands (not the
    SCROLL command) with the PROMPT display.

    If you do not specify a display, the current scrolling display is
    unselected and no display has the scroll attribute.

    By default, for all languages except MACRO-32, the SRC display
    has the scroll attribute. If the language is set to MACRO-32, the
    INST display has the scroll attribute by default.