--------D-214400-----------------------------
INT 21 - DOS 2+ - IOCTL - GET DEVICE INFORMATION
	AX = 4400h
	BX = handle
Return: CF clear if successful
	    DX = device information word (see below)
	    AX destroyed
	CF set on error
	    AX = error code (01h,05h,06h) (see AH=59h)
Notes:	value in DH corresponds to high byte of device driver's attribute word
	  if handle refers to a character device
	Novell NetWare reportedly does not return a drive number in bits 5-0
	  for a disk file
SeeAlso: AX=4401h,INT 2F/AX=122Bh

Bitfields for device information word:
 character device
  bit 14: device driver can process IOCTL requests (see AX=4402h)
  bit 13: output until busy supported
  bit 11: driver supports OPEN/CLOSE calls
  bit  7: set (indicates device)
  bit  6: EOF on input
  bit  5: raw (binary) mode
  bit  4: device is special (uses INT 29)
  bit  3: clock device
  bit  2: NUL device
  bit  1: standard output
  bit  0: standard input
 disk file
  bit 15: file is remote (DOS 3+)
  bit 14: don't set file date/time on closing (DOS 3+)
  bit 11: media not removable
  bit  8: (DOS 4 only) generate INT 24 if no disk space on write or read past
		end of file
  bit  7: clear (indicates file)
  bit  6: file has not been written
  bits 5-0: drive number (0 = A:)
--------D-214401-----------------------------
INT 21 - DOS 2+ - IOCTL - SET DEVICE INFORMATION
	AX = 4401h
	BX = handle (must refer to character device)
	DX = device information word (see AX=4400h)
	    (DH must be zero)
Return: CF clear if successful
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see AH=59h)
SeeAlso: AX=4400h,INT 2F/AX=122Bh