ABAP FAQ's

->How can validate input values in selection screen and which event was fired?

Ans) We can Validate Selection Screen With the Help of the Following Events, the Event Follows the Same hierachy.
AT SELECTION-SCREEN ON
AT SELECTION-SCREEN ON BLOCK
AT SELECTION-SCREEN OUTPUT
AT SELECTION-SCREEN.

->Have you created any transactions?
Ans) We can use TC SE93 for creating our own transaction code.

->How to navigate basic list to secondary list?

Ans) We can Navigate from basic list to secondary list with the help the event called AT LINE-SELECTION. for every Secondary List the System Field SY-LSIND increases by 1. So there will be Totally 21 list possible in SAP.

->What does SM35 transaction do?

Ans) we can create session.

-> How can u call the Sessions?

Ans) using transaction code SM35 .