To configure UAG to integrate NAP into its endpoint policies, the first step is to configure it as a Health Registration Authority (HRA). This is done on one of the organization's NAP health policy servers (HPS), in which UAG is configured as a RADIUS client. The term "client" may be confusing here, because UAG is a SERVER, but RADIUS terminology is such. A HPS server is the "server", and the HRAs are "clients". Hopefully, you can either hold your acronyms well, or have the patience to re-read this multiple times.
Once UAG has been defined as an HRA, you need to configure it to know who its health policy servers are (can be one or more), and finally, edit the endpoint policy settings to make UAG check the regular policies, or NAP policies, or both.
Installing a NAP HPS and creating a health policy is beyond the scope of this book, so if your organization has a person who owns the NAP service, consult him or her with regards to that, and also with regards to configuring...