IoctlHandleInfoRec

 DOS Fn 440aH (is file or device remote) returns this layout in DX.  The
 meanings of the bits vary depending upon the value in bit 7 (file/device).

IoctlHandleInfoFileRec ─── layout when describing a disk file
 1 1 1 1 1 1
╓5┬4┬3┬2┬1┬0┬9┬8╥7┬6┬5┬4┬3┬2┬1┬0╖
║r│t│0│i│0 0 0 0║0│o│ drive id  ║
╙╥┴╥┴─┴╥┴─┴─┴─┴─╨╥┴╥┴╥┴─┴─┴─┴─┴╥╜ bit  mask
 ║ ║   ║         ║ ║ ╚═════════╩═►0-5: 003fH drive ID (0=A, 1=B, etc.)
 ║ ║   ║         ║ ╚═════════════►  6: 0040H file has not been written to
 ║ ║   ║         ╚═══════════════►  7: 0080H 0=file
 ║ ║   ╚═════════════════════════► 12: 1000H 1=no inherit
 ║ ╚═════════════════════════════► 14: 4000H 1=date/time not set on close
 ╚═══════════════════════════════► 15: 8000H 1=remote file; 0=local file

IoctlHandleInfoDevRec ─── layout when describing a device
 1 1 1 1 1 1
╓5┬4┬3┬2┬1┬0┬9┬8╥7┬6┬5┬4┬3┬2┬1┬0╖
║r│0│p│i│s│0 0 0║1│e│b│f│c│n│o│i║
╙╥┴─┴╥┴╥┴╥┴─┴─┴─╨╥┴╥┴╥┴╥┴╥┴╥┴╥┴╥╜ bit  mask
 ║   ║ ║ ║       ║ ║ ║ ║ ║ ║ ║ ╚═►  0: 0001H Console Input device
 ║   ║ ║ ║       ║ ║ ║ ║ ║ ║ ╚═══►  1: 0002H Console Output device
 ║   ║ ║ ║       ║ ║ ║ ║ ║ ╚═════►  2: 0004H Null device
 ║   ║ ║ ║       ║ ║ ║ ║ ╚═══════►  3: 0008H Clock device
 ║   ║ ║ ║       ║ ║ ║ ╚═════════►  4: 0010H special device; fast output
 ║   ║ ║ ║       ║ ║ ╚═══════════►  5: 0020H binary mode; 0=ASCII
 ║   ║ ║ ║       ║ ╚═════════════►  6: 0040H not EOF; 0=EOF on input
 ║   ║ ║ ║       ╚═══════════════►  7: 0080H 1=device
 ║   ║ ║ ╚═══════════════════════► 11: 0800H network spooler
 ║   ║ ╚═════════════════════════► 12: 1000H no inherit
 ║   ╚═══════════════════════════► 13: 2000H named pipe
 ╚═══════════════════════════════► 15: 8000H 1=remote device; 0=local

See Also: fn 440aH (IOCTL is file/device remote)
          Device Attribute
          Device Drivers
          DOS Functions
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