The DRV_QUERYCONFIGURE message requests a user-mode multimedia driver to return a value indicating whether it provides modifiable operating parameters.
If the driver supports modifiable parameters, it should return a nonzero value. Otherwise it should return zero.
The DRV_QUERYCONFIGURE message is one of the standard driver messages. A client sends the message by calling the driver’s DriverProc entry point, passing the specified parameter values. Typically, this message is sent by the Control Panel’s Multimedia applet.
Drivers receive a DRV_OPEN message before receiving DRV_QUERYCONFIGURE.
If a driver provides modifiable parameters, it displays a dialog box when it receives a DRV_CONFIGURE command.