Cool.

> only the ones that have been modified by the application code

Sounds good (after a quick skim again I still can't see that but I'll take your word for it!).

I've had two attempts to build and test but unfortunately failed: currently can't build (src/unix/Client.cc:242: error: cannot convert ‘sockaddr_in’ to ‘const sockaddr’) and hello_world.c dumped core on me this time yesterday (Ubuntu 10.10).

"Work in progress" as you say... but it may just scratch an itch. I will come back again in a couple of months :) Thanks.