With IIS 6.0 as your application server, you can use the latest Web application platforms and standards, such as ASP.NET, XML, and Simple Object Access Protocol (SOAP), to develop, implement, and manage your Web applications. While continuing to build on the ISAPI programming model, IIS 6.0 provides several new features, including custom errors, server-side redirection, streamlined file and buffer response, and improved Unicode support.
IIS 6.0 supports both ISAPI extensions and ISAPI filters:
ISAPI extensions are DLLs that handle specific requests.
ISAPI filters are DLLs that you can register with IIS to modify the behavior of the server.
ISAPI extensions and filters load the first time a client ...