The DBQ attribute-keyword is the database qualifier. This is the fully qualified, default, working namespace.

Windows Server 2003:  The WMI Open Database Connectivity (ODBC) Adapter is not available in Windows Server 2003. When you upgrade to Windows Server 2003, the WMI ODBC Adapter is not removed if it already exists on a machine. For an alternative type of data access, see Microsoft Data Access Components (MDAC).