Returns a control string from a device driver.
IOCTL$([#]file_number)
file_number is the file number assigned to the device in its OPEN statement.
The IOCTL$ function is generally used to get acknowledgement that an IOCTL statement succeeded or failed. It is also used to get device information, such as device width after an IOCTL statement requests it.
'GW is a possible command
'for get device width
OPEN "\DEV\MYLPT" AS#1
IOCTYL#1, "GW"
'Save it in WID
WID=VAL(IOCTL$(#1))