A DEC DATATRIEVE procedure is a phrase, statement, or group of
       statements stored in the data dictionary. A procedure is defined
       by the DEFINE PROCEDURE statement (see HELP DEFINE PROCEDURE). A
       procedure can be invoked by the following construct:

       :procedure-path

       Procedure-path is the dictionary path of a previously defined
       procedure (see HELP Path_name). The procedure invocation
       (:procedure-name) is replaced by the text in the procedure.

       You can also invoke a procedure by entering the keyword EXECUTE
       followed by the procedure name.

       To display a procedure definition, type:

       SHOW procedure-name

       To obtain the names of the defined procedures, type:

       SHOW PROCEDURES