Specifies the next frame down the call stack from the call frame
    denoted by %CURRENT_SCOPE_ENTRY.

    The %NEXT_SCOPE_ENTRY symbol returns an integer value that
    denotes a call frame on the call stack. Call frame 0 denotes
    the routine at the top of the call stack, where execution is
    suspended. Call frame 1 denotes the calling routine, and so on.