LANSA Web supports both Single-tier and Multi-tier installations.
A Single-tier installation includes the Web Server and Data/Application Server on a single machine. A Multi-tier installation has the Web Server on one machine and the Data/Application Server on a separate machine.
If you install a Multi-tier configuration with a Windows IIS web server, the XSL Processing of your WAMs, by default, is moved to the Web Server tier, thereby distributing the processing load across the tiers. This option is configurable in Web Administrator, Local Configuration of your LANSA ISAPI Plugin.
For details, refer to Multi-Tier Web System Setup in the Web Administration Guide.