Its a pdf about plan9 authentication in linux by one Ashwin Ganti, sorry for the double post.
More info for people looking from the same vantage point as me..
This document is something I am about to read.. (I wasn't sure what a cap device in linux was, this was the most relevant google result.)
http://static.googleusercontent.com/external_content/untrusted_dlcp/research.google.com/en/us/pubs/archive/34433.pdf
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