The functions and messages associated with installable drivers are grouped as follows.
GetDriverModuleHandle
OpenDriver
SendDriverMessage
DRV_CLOSE
DRV_DISABLE
DRV_ENABLE
DRV_FREE
DRV_LOAD
DRV_OPEN
DRV_CONFIGURE
DRV_QUERYCONFIGURE
DRVCONFIGINFO
DefDriverProc
DriverCallback
DriverProc