This graphic is explained in the accompanying text Architecture of the SAP DB Web Tools Locate the document in its SAP Library structure

The SAP DB Web tools are implemented as a Web service and can be used with the SAP DB Web Server as well as with the well-known Apache Web server.

The Web services are installed together with the Web server on one computer. The database system can be on a different computer or on the same computer as the Web server.

This graphic is explained in the accompanying text

A connection to the client (Web DBM or Web SQL service integrated into the Web Server) is created by calling the SAP DB Web tool (Web DBM or Web SQL Studio) in the Web Browser. The communication between the client and the database instance takes place through the DBM Server for the Web DBM tool, and through the ODBC interface for the Web SQL Studio tool  (Architecture of the Query Tools).

See also:

Architecture of the SAP DB Tools