Just to be clear; are you indicating that you have split your database but you have the front-end so that multiple user access that file to use it?
In a split database environment, each use should have their own copy of the front-end file on their computer. That file is linked to the data.
You as the developer have your "master" copy of the front-end file in which you do your development of forms, report, etc. When you have updates to the front-end, you simply send a copy of the the new file to each user or implement some "auto-updater" method where you place the new front-end in a shared network location and have code that will copy the new version to each users computer when necessary.