• An N-tier API of Internet Information Services (IIS), Microsoft’s collection of Windows-based web server services. The most prominent application of IIS and ISAPI is Microsoft’s web server. The ISAPI has also been implemented by Apache’s mod_isapi module, so that server-side web applications written for Microsoft’s IIS can be used with Apache. Other third-party web servers like Zeus Web Server offer ISAPI interfaces, too. ← Wikipedia

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