/sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  Built in Symbols, %PREVIOUS SCOPE ENTRY
    Specifies the next frame up the call stack from the call frame
    denoted by %CURRENT_SCOPE_ENTRY.

    The %PREVIOUS_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.
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