For a combined file, the record, which is treated by the IBM® i device support as a single field, appears on the screen and is both the output record and the input record. Device support initializes the input record to blanks, and the cursor is placed in position 2.
For more information on program-described-display-device files, refer to the DB2® for i section of the Database and File Systems category in the IBM i Information Center at this Web site - http://www.ibm.com/systems/i/infocenter/.