Directs the installable driver to display its configuration dialog box and let the user specify new settings for the given installable driver instance.



Identifier of the installable driver. This is the same value previously returned by the driver from the DRV_OPEN message.


Handle of the installable driver instance.


Handle of the parent window. This window is used as the parent window for the configuration dialog box.


Address of a DRVCONFIGINFO structure or NULL. If the structure is given, it contains the names of the registry key and value associated with the driver.

Return Value

Returns one of these values:

DRVCNF_OK The configuration is successful; no further action is required.
DRVCNF_CANCEL The user canceled the dialog box; no further action is required.
DRVCNF_RESTART The configuration is successful, but the changes do not take effect until the system is restarted.


Some installable drivers append configuration information to the value assigned to the registry value associated with the driver.

The DRV_CANCEL, DRV_OK, and DRV_RESTART return values are obsolete; they have been replaced by DRVCNF_CANCEL, DRVCNF_OK, and DRVCNF_RESTART, respectively.


Minimum supported client
Windows 2000 Professional [desktop apps only]
Minimum supported server
Windows 2000 Server [desktop apps only]
Mmsystem.h (include Windows.h)

See also

Installable Drivers

Installable Driver Messages