Library /sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  SET  LOG  Parameters
 file-spec

    Denotes the file specification of the log file. If you do
    not supply a full file specification, the debugger assumes
    SYS$DISK:[]DEBUG.LOG as the default file specification for any
    missing field.

    If you specify a version number and that version of the file
    already exists, the debugger writes to the file specified,
    appending the log of the debugging session onto the end of that
    file.
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