You can invoke CDO as a foreign Digital Command Language (DCL) command.
 At the DCL prompt, type DICTIONARY OPERATOR and any CDO command.  After
 the CDO command executes, you are returned to the DCL prompt.

 Before invoking CDO with the DICTIONARY OPERATOR command, make sure
 that your CDD$DEFAULT is set to the CDO dictionary that you want to
 work in.  You cannot override your CDD$DEFAULT by using the DICTIONARY
 OPERATOR command.  To connect a CDO command that is longer than one
 line, use the hyphen (-) character.

 In the following example, the field definition MIDDLE_INITIAL is
 created using DICTIONARY OPERATOR as a DCL foreign command:

 $ DICTIONARY OPERATOR DEFINE FIELD MIDDLE_INITIAL -
 _$ DATATYPE IS TEXT SIZE IS 1.
 $