Developing ISAPI Extensions and Filters

The Internet Server Application Programming Interface (ISAPI) provides a set of interfaces that you can use to create extensions and filters for IIS. This document provides general overview material about the ISAPI architecture, and detailed instructions for creating your own ISAPI extensions and filters.

This section contains:

• ISAPI and the Web Application Architecture: Provides an overview of the ISAPI architecture.
• ISAPI and COM: Provides information about using ISAPI filters and extensions with COM.
• Pooled Out-of-Process Model for ISAPI: Introduces the new pooled out-of-process model that offers better protection against system instability than previous protection models.
• Developing ISAPI Extensions: Contains information about developing ISAPI extensions.
• Developing ISAPI Filters: Covers information necessary for developing ISAPI filters.
• Debugging ISAPI Extensions and Filters: Details procedures for debugging ISAPI Extensions and Filters.

For more detailed reference information, see the ISAPI Reference. ISAPI filter and extension examples are available in ISAPI Examples.