What are the events used in ABAP4?

The events are
• INITIALIZATION
• AT SELECTION-SCREEN
• AT SELECTION-SCREEN ON
• START-OF-SELECTION
• TOP-OF-PAGE
• TOP-OF-PAGE DURING LINE SELECTION
• END-OF-PAGE
• END-OF-SELECTION
• AT USER-COMMAND
• AT LINE-SELECTION
• AT PF
• GET
• GET LATE.
• AT User Command