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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$.
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