The following information supplements the Establishing a Connection section in the FDO Developer's Guide (http://fdo.osgeo.org/files/fdo/docs/FDG_FDODevGuide/index.html).
The FDO Provider for ArcGIS allows you to connect to all three supported Geodatabase types: Personal/File Geodatabase, Workgroup/SQL Express data source, Enterprise/ArcSDE-based data source.
The connection parameters depend on the type of the data source.