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$.