SAP ABAP Reports Questions

1. what is a report?
   
2. what are types of reports?
   
3. difference bet'n simple and interactive reports?
   
4. what are the events in interactive reports?
   
5. what is the first event that will be triggered in a report?
   
6. what is the use of Initialization event? give one example.
   
7. what is the use of start-of-selection event?
   
8. what is the difference betn end-of-page and end-of-selection?
   
9. if you write a write statement after end-of-selection, will that be triggered?
   
10. how to create a button in selection screen?
    
11. how to add a gui status in a selection screen?
    
12. what is at-line-selection event?
    
13. How many secondary lists can be created in an interactive report?
    
14. how to create a check box/option button in a list?
    
15. can you call a bdc program from a report? how?
    
16. can you call a transaction from a report? how?
    
17. what are ALV reports? how they are different from normal reports?
    
18. what are the main events that are used in an ALV report?
    
19. what is the use of SLIS type pool in alv reports?
    
20. difference betn top-of-page and top-of-page during at-line-selection?
    
21. in an interactive report, after going to 5th list, can you come back to 2nd list? how?