XCTL explanation and syntax...

* Transfers control to the next program.
* Program passing control is terminated.
* Transaction ID does not change.
* Control is passed at the same logical level.
* Program that transfers control is released.
* when the program that is to receive control is not resident in main storage, it is loaded by CICS
syntax:

EXEC CICS XCTL
                     program ( program name )
                     Commarea ( data-area )
                     Length ( data-value )
END-EXEC.