Questions and Answers about ABAP/4 and Developments

What is the difference between external & internal subroutine?

2. Why do we use ALV?

3. Why do we use GET CURSOR and what is it?

4. Both the events AT SELECTION-SCREEN and AT USER-COMMAND are processed after user input.
Then what is the difference between these and when we should use what?

Sudeshna

Answer 1:
1) Internal subroutines in the sense ..subroutines which are defined and used in a same program...external in the sense if you create a sub routine in one program and you're calling this subroutine in another program ..then this is external subroutine.

2) ALV gives many advantages than a list like sorting summing getting graphics like that stuff

3) While generating a interactive report we will use get cursor..use is to get the value of the fiel under the cursor..

4) At selection screen is used to validate the fields in a selection screen...and at user command is used to modify the screen in a selection screen and in genarating secondary lists..