Given access to a remote hard drive, Filemaker can see and open the database. This is NOT a good idea. File corruption and data mismatch.
The Only time this may be reasonable is if the remote user is ONLY viewing and not modifying data.
Given access to a local area network through the local router, a remote Filemaker can Open Remote a hosted FMP database.
To give access to a database open in FMP or FMP Server requires opening a port in your router [http://portforward.com] to the hosting computer.
To give access to a hosted database on your network to a remote user with a browser requires opening a port in your router.
https://www.google.com/search?q=IWP+site%3Aforums.filemaker.com Threads on these forums.
IWP Outside of Network Title: IWP Outside of Network