MDAC 2.5 SDK - OLE DB Programmer's Reference
Appendix C: OLE DB Properties
Property group: Initialization
Property set: DBPROPSET_DBINIT
Type: VT_BSTR
Typical R/W: R/W
Description: Initial Catalog
Indicates the name of the initial (or default) catalog to use when connecting to the data source object. If the provider supports changing the catalog for an initialized object, the consumer can specify a different catalog name through the DBPROP_CURRENTCATALOG property in the DBPROPSET_DATASOURCE property set after initialization.