| Drivers of type Front End / Back End
(FE/BE) allocate resources internally to enable the BE polling of a
device.
Typically this allocation is done in the driver upon receipt of
a CTDRV_INIT_UNIT command from the IOServer. Once initialised if a
device was reported DRIVER_UNIT_OFFLINE consequent CTDRV_STOP_UNIT
commands are not sent to the driver. Hence the driver will not
release any resources for that device.
As a result in this circumstance is not possible to stop a FE/BE
driver from issuing a poll other than stopping the channel or
stopping Citect.
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