What would be a good way to update NetBSD hosts on a network, i.e. I 
have a single development machine, on which I download src, xsrc  and 
compile the base system, other machines on the network are too slow for 
such tasks. I'd like to update those machines, but not sure how, I 
suppose I could copy sets across the network and unpack them on each 
machine, but then I have a feeling that running "./build.sh install=/" 
is the preferred method as it probably does update automatically without 
breaking things. What parts of the /usr/src tree do I need to run 
"./build.sh install=/" successfully?

Thanks