[RBASE-L] - Server based app

[MDRD]

Hi

I am not sure I am explaining this right but here goes.
I got a call from a guy that wants to have a medical billing app based on 
his server
where over 100 doctors offices can log on and enter patient billings and 
such.  All
data will be kept on his server and he would charge a monthly fee.

Has anyone done something like this?

Thanks
Marc