Compatibility: 2.0+
Expects: AX    4401H
BX    file handle  (device only)
Returns: AX    error code  if CF is set to CY
Info: This can change certain aspects of how DOS handles I/O with some
devices.  It cannot be used to affect disk file handles.

Bits 8-15 (i.e. DH) must be 0
Bit  7 must be set (1) to indicate a device
Bit  5 selects "raw" or "cooked" mode for character devices
Other bits specify special devices.  See IOCTL device info.

See Also: Fn 44H (IOCTL)
Fn 4400H (Query Device/File Flags)
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DOS Fn 4401H: IOCTL Set Device/File Flags