Event in ABAP report in SAP

ABAP Programming EVENTS in SAP.

Below are some of the events avalable within ABAP programming. 

1.LOAD-OF-PROGRAM
2.INITIALIZATION
3.AT SELECTION SCREEN OUTPUT

LOOP AT SCREEN.
  IF SCREEN-name = 'P_FIELd1'.
    SCREEN-INTENSIFIED = '1'.
    MODIFY SCREEN.
    CONTINUE.
  ENDIF.
ENDLOOP.

4.AT SELECTION-SCREEN.

5.AT SELECTION-SCREEN ON
<parameter1>
AT SELECTION-SCREEN ON Block <block1>
AT SELECTION-SCREEN ON HELP-REQUEST for <parameter1> (i.e. When press F1)
AT SELECTION-SCREEN ON VALUE-REQUEST for <parameter1> (i.e. When press F4)
AT SELECTION-SCREEN ON RADIOBUTTON for <parameter1> (i.e. When press F4)

AT SELECTION-SCREEN ON P_FIELD1.
AT SELECTION-SCREEN ON help-request for P_FIELD1.

6.TOP-OF-PAGE
7.TOP-OF-PAGE During LINE_SELECTION
8.END-OF-PAGE
ORT demo_rep NO STANDARD PAGE HEADING

                            LINE-COUNT 0(1). 

9.START-OF-SELECTION
10.END-OF-SELECTION