The goal of this stage in the conversion process is to provide a layer of abstraction between the base application and Microsoft SQL Server. Using the concept of a wrapper DLL, the base application, Btrvapp.exe, can access SQL Server data without modification. Essentially, the wrapper disguises the SQL Server data and responses as Btrieve data and responses to Btrvapp.exe. The wrapper uses Btrieve-like result set processing techniques to access two nonnormalized tables, bsales and titlepublisher. These tables are structured to maintain the same details as the Sales and Titlepub files accessed by Btrvapp.exe. Although the ODBC and SQL Server implementation techniques presented in the wrapper DLL are not optimal, they present an initial access methodology that is similar to Btrieve.