Events in Module Pool programming in SAP ABAP :

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EVENTS IN MODULE POOL PROGRAM:
1. Process before output (PBO).
2. Process after input (PAI).
3. Process on value-request (POV).
4. Process on help-request (POH).

 PROCESS BEFORE OUTPUT(PBO) : PBO event is triggered before the screen is displayed.PBO event is used to assign some default values to screen fields.With those values the field will be displayed.

 PROCESS AFTER INPUT(PAI) : PAI event is triggered after giving input to the screen fields and PAI is used to handle user actions on the screen.

 PROCESS ON VALUE-REQUEST(POV) : POV is used to give F4 help to screen fields.

 PROCESS ON HELP-REQUEST(POH) : POH is used to give F1 help to screen fields.

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