Library /sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  Built in Symbols, %CURSCROLL
    Specifies the current (screen mode) scrolling display. This is
    the default display for the SCROLL, MOVE, and EXPAND commands, as
    well as for the associated keypad keys (KP2, KP4, KP6, and KP8).

    Example:

    DBG> EXPAND/DOWN:5 %CURSCROLL
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