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there is a data cluster in memory with the name <key>, SY-SUBRC is always 0, regardless of whether it contained the data object <f i >. If the cluster does not contain the data object <f i >, the target field remains unchanged. Explain the READ LINE and MODIFY LINE commands. READ LINE :- Use the statements READ LINE and READ CURRENT LINE to read data from the lines of existing list levels. These statements are closely connected to the HIDE technique. MODIFY LINE :- To modify the lines of a completed list from within the program, use the MODIFY LINE statement. What are the differences between calling a program, transaction `with return' and `without return' and how can each be accomplished? · Program -SUBMIT <rep>|(<field>) [AND RETURN] [<options>]. If you use AND RETURN, the system stores the data of the calling executable program and returns to the calling after processing the called program. The system resumes executing the calling program at the statement following the call. If you omit the AND RETURN addition, all data and list levels of the calling program (the entire internal session) are deleted. After the called executable program has finished, control returns to the level from which you started the calling program. · Transaction -CALL TRANSACTION <tcod> [AND SKIP FIRST SCREEN] [USING <itab>]. This statement saves the data of the calling program, and starts transaction <tcod>. At the end of the transaction, the system returns to the statement following the call in the calling report. -LEAVE TO TRANSACTION <tcod> [AND SKIP FIRST SCREEN]. This statement ends the calling program and starts transaction <tcod>. This deletes the call stack (internal sessions) of all previous programs. At the end of the transaction, the system returns to the area menu from which the original program in the call stack was started. What are the differences between the parameter SET and GET? SET PARAMETER ID <pid> FIELD <f>. This statement saves the contents of field <f> under the ID <pid> in the SAP memory. The code <pid> can be up to 20 characters long. If there was already a value stored under <pid>, this statement overwrites it. If the ID <pid> does not exist, double-click <pid> in the ABAP Editor to create a new parameter object. GET PARAMETER ID <pid> FIELD <f>. This statement fills the value stored under the ID <pid> into the variable <f>. If the system does not find a value for <pid> in the SAP memory, it sets SY-SUBRC to 4, otherwise to 0. WHAT are the commands that allow you to process sequential file? And what is their syntax? · READ DATASET (reading) and TRANSFER (writing)