An integer value specifying the item of information that the
       FN$PROCESS_INFO function is to return; the integer value is one
       of the values used by the $GETJPI system service.

       DEC DATATRIEVE supplies a table associating symbolic strings to
       values of the $GETJPI system service. The table is called JPI_
       CODES, located in CDD$TOP.DTR$LIB. If you use the JPI_CODES table
       with this function, the syntax is:

       FN$PROCESS_INFO ("symbolic-string" VIA CDD$TOP.DTR$LIB.JPI_CODES)

       Where symbolic-string is a text string defined in JPI_CODES. The
       text string must be placed inside quotation marks.

       For a complete description of the item codes, see the $GETJPI
       service documented in the OpenVMS System Services Reference
       Manual.