How to convert your current backend to SQL and then link to that. Also to check if BE or datafile exist when the database open and if not to search for the file or give user the change to change the default location before giving full access or load the full FE side of the database app.
Secondly how to distribute or developed the database that the front end can be used on other devices like smartphones or Tablets (If this is possible at all) without going the web or using the web interface developer in Access 2013