The fine folks at FrameChannel have shared with me (and granted permission to share with you) the ‘FrameChannel Certification Checklist’.
This document details basic operation of a FC compliant device (photo frame). It specifies the request made by the frame of the service and how the frame should display the images contained in the RSS feed provided by FrameChannel.
A copy of the PDF document is available here: FrameChannel Certification Checklist v20