\section{Acknowledgments}

We would like to thank Robert French, Ted Ts'o, and Brian LaMacchia
for their work on the implementation of {\it Discuss}; Nancy Gilman
for her efforts to document {\it Discuss} for mortal users;  Brian
LaMacchia, Andrew Berlin, Dan Geer, Judith Provost, Ron Hoffmann and
others for reviewing early drafts of
this this paper;  the fellow members of the SIPB\footnote{All of the
authors are members of the SIPB.  Ken, Jon, and Stan have served as
Chairman of the SIPB.}
for fostering the kind of supportive
environment that leads to work such as {\it Discuss}; and
most of all, the users, who have made {\it Discuss} a success.