IOCTL Statement, IOCTL$ Function
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IOCTL transmits a control string to a device driver.
IOCTL$ returns current status information from a device driver.
IOCTL [#]filenumber%, string$
IOCTL$([#]filenumber%)
■ filenumber% The number of an open device.
■ string$ The control string sent to the device.
■ IOCTL control strings and the information returned by IOCTL$ depend
on the device driver. See your device-driver documentation for
information about IOCTL control strings and what is returned by IOCTL$.