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What is a screen group ? How it is useful ? Screen group is a field in the Screen Attributes of a screen. Here we can define a string of up to four characters which is available at the screen runtime in the SY- DNGR field. Rather than maintaining field selection separately for each screen of a program, we can combine logically associated screens together in a screen group. What is a Subscreen ? How can we use a Subscreen ? A subscreen is an independent screen that is displayed in an area of another ("main") screen. To use a subscreen we must call it in the flow logic ( both PBO and PAI ) of the main screen. The CALL SUBSCREEN statement tells the system to execute the PBO and PAI events for the subscreen as part of the PBO or PAI events of the main screen. The flow logic of your main program should look as follows: PROCESS BEFORE OUPTPUT. CALL SUBSCREEN <area> INCLUDING '<program>' '<screen>'. PROCESS AFTER INPUT. CALL SUBSCREEN <area>. Area is the name of the subscreen area you defined in your main screen. This name can have up to ten characters. Program is the name of the program to which the subscreen belongs and screen is the subscreen's number. What are the restrictions on Subscreens ? Subscreens have several restrictions. They cannot: Set their own GUI status Have a named OK code Call another screen Contain an AT EXIT-COMMAND module Support positioning of the cursor How can we use / display table data in a screen ? ABAP/4 offers two mechanisms for displaying and using table data in a screen. These mechanisms are TABLE CONTROLS and STEP LOOPS. What are the differences between TABLE CONTROLS and STEP LOOPS ? - TABLE CONTROLS are simply enhanced STEP LOOPS that display data with the look and feel of a table widget in a desktop application. But from a programming standpoint, TABLE CONTROLS and STEP LOOPS are almost exactly the same. One major difference between STEP LOOPS and TABLE CONTROLS is in STEP LOOPS their table rows can span more than one line on the screen. By contrast the rows in a TABLE CONTROLS are always single lines, but can be very long. ( Table control rows are scrollable ). The structure of table controls is different from step loops. A step loop, as a screen object, is simply a series of field rows that appear as a repeating block. A table control, as a screen object consists of : i ) table fields ( displayed in the screen ) ii ) a control structure that governs the table display and what the user can do with it.