The MapViewer offers two data connection modes: Read-only and Data Editing. In the Read-Only mode, data editing is not allowed through the MapViewer. The MapViewer can link to the following ESRI data storage structure (personal geodatabase, file geodatabase, ArcServer (ArcSDE)) without altering the GIS data. The Data Editing mode allows the user to perform simple edits on the GIS data through the MapViewer.