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SAP Web AS: The whole system consisting of one or more SAP Web AS instances and the underlying database management system (DBMS) seen as a single entity. Often SAP system is used as a synonym.

Database system(DB, DBMS): Database software or database management system that supports the SAP Web AS.

ABAP Central instance (CI): SAP Web AS instance without a DBMS, but including the enqueue work process. Normally, on this machine the message server is also running. In addition, the CI normally contains additional work processes (dialog, update, batch, spool) and services such as gateway or sapcomm. A CI can work as a standalone SAP Web AS unit, but also requires a database. When using the SAP Web AS with an integrated installation, the CI contains also the Java CI.

Java Central Instance (Java CI): SAP Web AS instance without a DBMS, but including a Java dispatcher, Java servers, and the Software Delivery Manager (SDM). Normally, on this machine the SCS (see below) is also running.

SAP Central Services (SCS): SAP Web AS instance, containing the enqueue and message service for the J2EE Engine.

Central system: Full SAP Web AS instance including DBMS. A central system is a standalone SAP Web AS unit.

Dialog instante (DI): SAP Web AS instance, without a DBMS, consisting of a dispatcher process and several kinds of work processes (dialog, update, batch, spool) and additional services such as gateway or sapcomm. A dialog instance does not contain the central, system-critical enqueue and message service components.

SAP Web AS instance: General expression for a single SAP Web AS client-server unit that runs on a specified host machine. An instance can be a central system or a dialog instance application server. It is started as a unit that is configured in a common instance profile.