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An Internet server API (ISAPI) is a set of ready-made Windows program calls that developers and programmers can use in order create custom enhancements or extensions to ISAPI-compliant HTTP servers or web servers. These enhancements are called Internet Server Extension Applications (ISA) and ISAPI filters, which provide functionalities such as database invocation and even for building Web pages dynamically for a Web client (browser) to display.
The Internet Server Application Programming Interface makes it easier to write database applications like an entry system for order forms or for a custom catalog. With ISAPI, a programmer can collect information from a user through an HTML form and then return a page which has been customized for that user.
ISAPI enables a programmer to write two types of extensions for a server: