Answer Posted / naresh

SINCE WE KNOW SAP ABAP IS A EVENT DRIVEN LANGUAGE .
EVERY OBJECT(PROGRAM) IS EXECUTED BY AN EVENT.
EVENT IS NOTHING BUT A TRIGGERING .
IF ONE EVENT IS TRIGGERING THEN RELATED CODE IS EXECUTED.
DEFAULT EVENT OF SAP ABAP IS "START-OF-SELECTION".

The events in ABAP are:
Classical Events:
1)load of page
2)initilization
3)At selection-screen
4)At selection-screen on field
5)At selection-screen on value request
6)At selection-screen on help request
7)start-of-selection
8)end-of-selection
9)top-of-page
10)end-of-page

Interactive evens:
1)At line selection
2)At pf status
3)At user-command
4)Top-of-page during line selection

Module pool Events
1)PBO-Process Before output
2)PAI-process After Input
3)POV-Process on value request(F1 help)
4)POH-process on help request(F4 help)

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