Setting printer properties

I'm not very familiar with server 2003 but have customers who install our
print drivers onto the server. I hope that someone can explain a couple of
things in general.

It seems that in one case when you add a printer onto a client that the
client uploads the driver files from the server and that client prints using
the installed driver. Is this correct?

There also seems to be a case where a printer is 'shared' on a network; I
assume a printer connected to a particular client. How does a another client
get access to the printer and printer driver files?

In either case, if the driver properties are changed, how do all of the
clients pick up the changes?

Thanks