Library /sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  SET  ATSIGN  Description
    When you invoke a debugger command procedure with the execute
    procedure (@) command, the debugger assumes, by default, that the
    command procedure file specification is SYS$DISK:[]DEBUG.COM. The
    SET ATSIGN command enables you to override this default.

    Related commands:

       @ (Execute Procedure)
       SHOW ATSIGN
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