1.DBG> SHOW ATSIGN
      No indirect command file default in effect, using DEBUG.COM
      DBG>

      This example shows that if you did not use the SET ATSIGN
      command, the debugger assumes command procedures have the
      default file specification SYS$DISK:[]DEBUG.COM.

    2.DBG> SET ATSIGN USER:[JONES.DEBUG].DBG
      DBG> SHOW ATSIGN
      Indirect command file default is USER:[JONES.DEBUG].DBG
      DBG>

      In this example, the SHOW ATSIGN command indicates the default
      file specification for command procedures, as previously
      established with the SET ATSIGN command.