There might be instances where you want to mask certain data in records from general users of the Master Index Data Manager and only allow access by administrators. To do this, you can create a custom plug-in that displays asterisks (or other symbols) in place of the field values on the MIDM. Once you define the custom plug-in, specify the name of the custom plug-in Java class in the object-sensitive-plug-in-class element of midm.xml).