The problem arises when it is necessary to quickly update a write-protected device with, for example, a security hotfix (also known as a "QFE", which stands for "quick-fix engineering"). In the article, Aaron Stebner goes through the end-to-end process of configuring a write-protected embedded image by using EWF, and then rapidly deploying updates to an image by using DUA after it is deployed and running on a device in the field.
Stebner shows how to configure EWF with a RAM overlay and how to set up DUA to accept QFE patches. He then proceeds to show how the DUAScriptGen "power toy" is used to create a DUA script to apply a Windows XP Embedded QFE to a device running EWF and DUA without requiring any intervention or access to the devices themselves.
Read the full MSDN article
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