I currently use FB 2.1 but only single or max. 2 users are connecting at
the same time.

I would like to go "real" multi users, i.e. at least tens if not
hundreds of connections. There are some obvious changes I need to do
for data owner ship (i.e. a userid in a lot of tables) but I wonder what
else I need to watch out for.

Are there some good links people can recommend I should read before
starting with all this, is there anything really FB specific I have to
watch out for?

Werner