The application will connect to the QODBC 32-Bit or 64-Bit Driver.
If you use QRemote, your application will connect to QRemote 32-Bit or 64-Bit Driver.
In the case of QRemote DSN, QRemote Client will connect to QRemote Server, and QRemote Server will connect to QODBC 32-Bit DSN.
All the data exchange between QODBC and QuickBooks uses Intuit’s QuickBooks SDK.
QODBC or QRemote cannot connect directly to the QuickBooks company file.
A few applications example, MS Access, will keep the connection open once a data exchange is demanded. Connection is persistent until your application is running or closes the connection.
All applications must connect, perform data exchange(s) and close the connection. It is always in demand.