ERROR

       Provides additional information on the last error message that
       you received.

    topic

       Is a DEC DATATRIEVE command, statement, statement element, or
       error. Use commas to separate each topic from the next.

     . . . (ellipsis)

       Indicates that all help subtopics and any of their subtopics
       should be displayed.

    ? (question mark)

       Is a synonym for HELP.