The Controls Technology Framework resides on the application server (the back-end), and the Automation Controller sits on the presentation server (the front-end). The integral component that optimizes the communication between the two is the Automation Queue.
Let’s review some of the technical aspects of controls technology:
-The SAP Control Framework
-The Automation Queue, and the issues surrounding “flushing” it
Including Controls Technology controls on the front-end establishes a client/server relationship between the application server and the controls on the presentation server.
No matter if you create an enhancement point or a BAdI as an enhancement option provider, or if you implement an existing enhancement option (be it implicit or explicit), what you create must fit into the structure of the Enhancement Framework in a way that enables you to collect and organize the enhancement options and their counterparts on the implementation side.
In addition to the new kernel-based BAdI, there are many other types of enhancement options that are part of the new Enhancement Framework. You implement these enhancements using the Enhancement Framework tools, which are integrated into the ABAP Workbench
In all the aspects, enhancements are more powerful than modifications, even given all the modification support that transaction SPAU offers. The reason is due to an important difference between an enhancement and a modification that stems from the conceptual difference between the two technologies.