I will take a closer look at the SDK/ZIP file and hopefully it will help me.
Or you can save time by ignoring it. Visigenic ODBC (the later VisiODBC) is a different ODBC driver product from a different company Visigenic Software, Inc. which was acquired by Borland in late 1990s.
The Q+E ODBC developed by Pioneer Software which was renamed to Q+E Software and later bought by Intersolv in 1994 is based on ODBC Version 1. The book mentioned in the former answer can still be used. Intersolv is no longer existing, it became Merant when bought by Micro Focus. The DataDirect ODBC stuff was branched out and is now available from Progress Software.
ODBC is the API. There seems to be some confusion about the right terms for ODBC driver manager, ODBC driver and ODBC driver implementation in the former answers.