You could download the demo onto other computers (on same network is easiest) and test the multi-user option.
FMP and FMP Advanced support 9 users with FMP installed on their computers.
You could test the Instant Web Publishing option by turning it on in Sharing. (on same local network is easiest)
FMP and FMP Advanced support 5 concurrent users accessing with a web browser.
Google "IWP site:forums.filemaker.com" for threads about it on these forums.
This is a list of FMP links that may be useful. http://forums.filemaker.com/posts/f6ed4be796?commentId=222931#222931
They do not have a local area network. I was thinking about having it hosted. There are several hosting sites with a trial testing period. So I just might try that.
Thanks S Chamblee
Since they don't have a file server, we could have it hosted and then each person would need their own copy of the database. But that would be cost prohibitive.
The alternative to installing a copy of FileMaker on each user's machine is to use that hosting service to publish your database to the web using Instant or Custom web publishing. Then your user's would use their web browsers to access the database.
Both options should be researched carefully to understand the strenghs and weaknesses of each approach.
I plan to use the hosting service to do as you suggest. Also, I did some research and there is away to have each user work with their records only which is great!