ABAP User Dialogs
Module Pool
  Programming
 Screen Painter
 MPP, FLOW LOGIC and SCREEN
Screen Events included are:
 1.   Process Before Output       - PBO -
   Output Module
 2.   Process After Input         - PAI   -
   Input Module
 3.   Process On Value-Request    - POV -
   Input Module
 4.   Process On Help-Request     - POH -
   Input Module
Creation of a Package:SE80: Object
Navigator
A Package is a collection of transportable
objects that could be transported from one
SAP system to another SAP system in the
System Landscape.
Where we shall save all our
 - MPPs
 - Screens
 - T-codes , etc
Basic Steps included are:
 1. Creation of Module Pool Program (SE38).
 2. Creation of Screen with Screen Elements
    and Flow Logic (SE51).
 3. Define/Write/Develop the INPUT/OUTPUT
    modules under respective screen events
    (PBO, PAI, POH, and POV).
 4. Assign Menu Status to the program
    (SE41).
 5. Create a T-Code (SE93), assigning the
    screen number to the program.