Users are able to run sessions using the default configuration that you define. Users can modify this default configuration according to personal preference. These personalized changes are stored on users' local machines separate from any default session configuration information (assuming you gave them permission to save changes in the Deployment Wizard). When you change the default configuration, users will automatically receive updates without losing any personalized changes. If you lock a particular session property, you will override any changes the user may have made to that particular property.