We don't know how many such systems we are talking to at any given time. Each domain is mutually suspicious but we must communicate until we are done. This is a big step beyond today's firewalls. It is also a step away from C1, B2, etc. levels of security aiming at a richer scheme for insuring safeguards in federated systems with mixed security levels. How will the transition take place.
First step is to develop a combined threat model.
Distributed computing solutions today are highly proprietary, brittle and expensive to change. This gives us a massive marketing domain. The architecture looks like web clients and servers talking to backend business objects, uses generic client and web server software. There are requirements for loosely coupling business functions and business GUI interfaces. The rest of the day was spent continuing a discussion started in Madrid on potential areas that Internet Services RFI responses might cover.