Sharing and hosting files
To share a file, you must open it with an account that has Manage extended privileges access privileges. Once sharing is enabled for a file, the first user to open the file becomes that file’s host. Users do not need to have Manage extended privileges access privilege to become the host of a database, but must have these access privileges to change the sharing status of a file. See About accounts, privilege sets, and extended privileges for more information.
To host a FileMaker Pro file, you open it and make it available to other FileMaker Pro users on your local area network. Other users who open the file become clients of that file.
For the greatest security and performance, only share those files that you need to share.
Related topics 
File hosting troubleshooting
Topics in this section
Opening files as the host