Your database has to be hosted by filemaker or filemaker server. It depends on number of connections you need. filemaker allows sharing up to 9 users. filemaker server 100 user. Your isp will have to have filemaker server. I understand there are a few isp that been listed on this formum that host filemaker databases but I don't know anything about them. You can click on filemaker under products and then click on compare products to view more information on which product you might need. You should be able to google "Filemaker Hosting" to find a isp that host filemaker databases.
Thanks for this
As I feared.
I may look into sharing from a home-based computer with static IP and running FM Pro.
There should be nothing to fear. If you have a static IP address at home then it is even easier, but it can be made to work even with a dynamic IP. Set up the home-based computer to have a fixed IP inside your network. Set up your router's port-forwarding to forward TCP/IP traffic on port 5003 to that 'server' IP.
Give your colleagues the IP address, and you're basically up and running.
I'll give it a go.