Int 21 Fn 440D  - Ms-dos 7.0 - Generic Ioctl - Get Lock Flag State         [D]

   AX = 440Dh
   CX = 086Ch (category code 08h, minor code 6Ch)
   BL = drive number (00h=default,01h=A:,etc)

Return: CF set on error
       AX = error code (01h,02h,etc.) (see #1366 at AH=59h/BX=0000h)
   CF clear if successful
       AX = access flag (see #1263)

See Also: AX=440Dh"DOS 3.2+",AX=440Dh/CX=084Ah,AX=440Dh/CX=084Bh

See Also: AX=440Dh/CX=0870h

(Table 1263)
Values for drive access flag:
 0000h no writes/file mappings since last call
 0001h write operation has occurred since last call
 0002h file mapping has occurred since last call

Note:  function 6Ch resets the access flag every time it is called