ABAP Keyword Documentation → ABAP Glossary
Application Server ABAP
AS ABAP for short. AS ABAP represents the application layer of an ABAP system in which ABAP programs are executed. It provides the ABAP runtime environment and contains communication components such as the RFC interface, Internet Communication Manager (ICM), and ABAP Channels. It supports Internet protocols (HTTP/HTTPS/SMTP, WebSocket protocol, and TCP) plus XML. An AS ABAP is implemented using a single message server and one or more AS Instances. It has a system ID used by users to log on and dedicated user administration based on a user master record.