You use open remote to open the databases from client computers.
You do not use a shared folder for filemaker databases because the file could become corrupt.
And this requires installing either FileMaker Pro or FileMaker Server on the server machine. It must have the file open first, then clients can use Open Remote to open and access the hosted database.
And you may encounter static from your IT guy as he may not want to install either of these programs on the server.
Good point PhilModJunk, I assumed they had filemaker server running on the server and then I reread the post.