# Internet Information Services Architecture

IIS is an integral part of the Windows DNA architecture. An important role of IIS is to link clients accessing the system through the Hypertext Transfer Protocol (HTTP) to the other Windows DNA services, such as DHTML, ASP, and so on. In addition, IIS includes a basic set of functionality that systems developers can extend to define a customized application architecture.

This section contains:

- IIS Core Functionality: Describes the basic functionality that you can use to build Web applications.
- IIS and Component Services: Outlines the functionality used to isolate, manage and coordinate processing for transactional ASP applications.
- IIS Request Processing: Describes the evaluation procedure used to determine a request type.

The topics in this section describe this basic functionality, and define the relationship of IIS architecture to the rest of the Windows DNA architecture. A general outline of how IIS processes HTTP requests is also provided.

© 1997-2001 Microsoft Corporation. All rights reserved.