The USING clause identifies the source of data for display.
General Format
Syntax Rules
The USING clause is equivalent to the TO and FROM clauses, both
specifying the same identifier. It must not be used with either the TO or FROM
clause.
The identifier in the USING clause can be qualified. If no OCCURS
clause applies to the screen item, this identifier can be subscripted or
indexed. It must be defined in the File, Working-Storage, Local-Storage, or
Linkage Section of the program.
General Rules
Executing a DISPLAY statement on a screen item whose description
includes a USING clause moves data from the associated data item to the screen
item, and then displays the screen item on the screen.
Executing an ACCEPT statement on a screen item whose description
includes a USING clause accepts operator-keyed data into the screen item, and
then moves that data to the associated data item.