What is top level transaction in SAP BC-ABA - ABAP Runtime Environment?

SAP Term: top level transaction

• Component: BC-ABA

• Component Name: ABAP Runtime Environment

• Description: The first program of a call chain. The ABAP Memory assigned to a call chain is retained for as long as the internal session of the top level transaction is loaded.

Smart SAP Assistant

• Key Concepts: 
  A top level transaction is a type of transaction in the SAP system that is used to access the main menu of the SAP system. It is the first transaction that is executed when a user logs into the system. It is also used to access other transactions and programs within the system. 
  
  How to use it: 
  To use a top level transaction, a user must first log into the SAP system. Once logged in, the user can access the main menu by entering the top level transaction code. From there, they can access other transactions and programs within the system. 
  
  Tips & Tricks: 
  It is important to remember that a top level transaction is not the same as a regular transaction. A regular transaction is used to perform specific tasks within the system, while a top level transaction is used to access the main menu and other transactions and programs within the system. 
  
  Related Information: 
  The top level transaction code for the BC-ABA ABAP Runtime Environment is SE93. This code can be used to access the main menu of this particular SAP system.