INT 21 - MS-DOS 7.0+ - GENERIC IOCTL - GET LOCK FLAG STATE AX = 440Dh CX = 086Ch / 486Ch (category code 08h for FAT12/16, 48h for FAT32; minor code 6Ch) BL = drive number (00h=default,01h=A:,etc) Return: CF set on error AX = error code (01h,02h,etc.) (see #01680 at AH=59h/BX=0000h) CF clear if successful AX = access flag (see #01576) SeeAlso: AX=440Dh"DOS 3.2+",AX=440Dh/CX=084Ah,AX=440Dh/CX=084Bh SeeAlso: AX=440Dh/CX=0870h