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Microsoft Forefront UAG 2010 Administrator's Handbook by Ran Dolev, Erez Ben-Ari

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How UAG works

UAG's core functionality is as an ISAPI filter and extension, as well as various mechanisms to control other parts of Windows. ISAPI (Internet Server Application Programming Interface) is a technology that allows programmers to build add-ons for websites, enriching their functionality. UAG is heavily reliant on ISAPI to do its job, and integrates itself into Internet Information Services (IIS), Microsoft's Web server components that ships with Windows. This integration gives UAG its "face"—users logging in see a website that is generated by UAG, and UAG's ISAPI filter and extension are the components that fetch data from internal servers and show it to the user.

To do this, UAG has a mechanism that allows it to manipulate the IIS ...

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