This keyword is used to make the function key available to
This keyword is used in a case we don’t want to pass any
information from the display device to the program. e.g. F3 = EXIT,
It can be used at file level or record level.
The format of this keyword is :
CAnn(response indicator ‘Text’)
Response indicator can be from 01
nn varies from 01 through 24.
Where we press the function key specified by CAnn, then the
response indicator gets turned on and we can take the necessary action based on
if the response indicator is on or off.
Display file entry: CA03 has been used here to
control the EXIT from the program.
We can control the EXIT with the help of option indicator
used here i.e. 03.
0002.00 A CA03(03
We can check the option indicator 03 in the program
and can take necessary action when it is pressed as shown below:
0023.00 C *IN03 DOWEQ *OFF
0023.01 C 03 LEAVE
0024.00 C EXSR MAIN
0026.00 C ENDDO
0027.00 C SETON LR