You can use a copy of Filemaker Pro set to share the file in question on its drive and the remote users can sync their files with that one. Takes a bit of work.
You could script this to work after they save a record but usually an internet connection may be questionable and then waiting for the connectin is an issue.
I've been working with this for a while and should mention that there is a commercial solution available that may seem a bit expensive called GoZync. They have produced a free single table file to whet your appetite.
The best solution is to have Filemaker Server running so your remote people can connect directly... Any sync solution will involve a local 'server'.
Thanx for this. I am going to mess aroud with FM Pro file sharing and see if I can get that working. I would love to get a server up and running but my client doesn't want to spend the money. Oh well hopefully by the time I need to send out updates to the file they might have changed there mind :) Here's hoping :) Thanx again for the info, and also thanx again for all the wodnerful info you have on your site. I have learnt a fair bit about FM from reading your site. Thanx again.