The little wheels represent things that run on the server. So just by looking at this one diagram I can see what runs on the server, what runs on the client, and what business objects they have to deal with.
Hivyo tu kwa kuangalia mchoro huu moja siwezi kuona nini anaendesha server, nini anaendesha juu ya mteja, na nini biashara vitu wao kuwa na kushughulika na.