Microsoft Data Access Components

<database> (MDAC) Microsoft's umbrella term for their ActiveX Data Objects (ADO), OLE DB, and Open Database Connectivity (ODBC) libraries. Together, these provide access to a variety of data sources, both relational (SQL) and nonrelational. MDAC is the technology that supports Universal Data Access, Microsoft's strategy for providing access to information across the enterprise.

http://msdn.microsoft.com/library/en-us/mdacsdk/htm/mdacstartpage1.asp.

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