There are several options for setting up your Web servers and SAP Adaptive
Servers to install the SAP jConnect driver and to use a gateway with the TDS-tunnelling
servlet.
Web Server and SAP Adaptive Server on Separate Hosts
In a three-tier configuration, the SAP Adaptive Server is on a separate host than the Web server. SAP jConnect requires a gateway to act as a proxy to the SAP Adaptive Server.