The answer is continuously. When a health changing event occurs, the client notifies its enforcement point. Below is a link to a blog from Joe Davis, Senior Program Manager for NAP at Microsoft.
http://blogs.technet.com/nap/archive/2008/09/05/what-is-the-nap-client-doing.aspx
http://blogs.technet.com/nap/archive/2008/09/05/what-is-the-nap-client-doing.aspx
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