/sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  SHOW  STACK  Qualifiers  /START_LEVEL
       /START_LEVEL=n

    Directs SHOW STACK to begin displaying information at call frame
    level n. For example, to see stack information for only frame 3,
    enter the following command:

    DBG>  SHOW STACK/START=3 1

    To see details for the 4th and 5th stack frames, enter the
    following command:

    DBG>  SHOW STACK/START=4 2
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