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Natural provides an extensive message optimization capability. Prior to sending an output screen, Natural determines which portion of the screen has been modified; only data which have actually been modified are sent.
This is to be considered when, between two successive terminal outputs, portions or the entire terminal contents are changed
by using the CLEAR key or
by intervening dialog steps at system level (K2 interruption or similar interruption).
This is particularly true if a subprogram called from Natural by an
external CALL interface produces dialog output.
In the above-mentioned cases, you can use one of the following methods to cause Natural to restore the most recent terminal screen contents.
Issue the terminal command %R.
Use the statement SET
CONTROL 'R'
