The following finally worked:

DECLARE Integer SQLConfigDataSource in odbccp32 ;
   Integer, Integer, String, String
lnInt1 = 0
lcODBCDriver="Microsoft ODBC for Oracle"
*!*the ODBC parameter has to be the driver descript, not the DLL name
lcSettings="Description=Region 6 Locator"+chr(0)+;
           "DSN=Locator"+chr(0)+;
           "Server=Reg6"+chr(0)+;
           "UID=reader"+chr(0)
lnSuccess=SQLConfigDataSource(0,ODBC_ADD_DSN,lcODBCDriver,lcSettings)
return lnSuccess

Thanks for pointing me in the right direction on the MSDN, etc.