What is 'system ID' in SAP BC-ABA - ABAP Runtime Environment?

system ID - Overview

• Component: BC-ABA

• Component Name: ABAP Runtime Environment

• Description: SID for short. ID or name of an AS ABAP. A system ID has three characters and is the content of the system field sy-sysid.

system ID - Details

• 
  Key Concepts: 
  System ID (SID) is a unique identifier for an SAP system. It is used to identify the system in the SAP landscape and is composed of three characters. The SID for the BC-ABA ABAP Runtime Environment component is ABA. 
  
  How to use it: 
  The SID is used to identify the system in the SAP landscape and is used in various scenarios such as when logging into the system, when connecting to other systems, and when configuring communication between systems. 
  
  Tips & Tricks: 
  It is important to remember that the SID for a system can change if the system is moved or reconfigured. Therefore, it is important to keep track of the SID for each system in your landscape. 
  
  Related Information: 
  For more information on System IDs, please refer to the SAP Help Portal: https://help.sap.com/viewer/product/SAP_BASIS/7.50/en-US/f8d9f3a2b6c14e8a9f3d7c2b5f9e4d1a.html