Microsoft Universal Data Access  
   An overview of Microsoft's Universal Data Access and the Microsoft Data Access Components and also includes links to the FAQ and several related whitepapers.
   http://www.microsoft.com/data/

Pooling in the Microsoft Data Access Components  
   Discusses the benefits, features, and behavior of pooling within the context of the MDAC architecture, including technology-specific tips for OLE DB, ADO, and ODBC developers. (Leland Ahlbeck and Don Willits / Microsoft)
   http://msdn.microsoft.com/library/en-us/dnmdac/html/pooling2.asp