Int 21 Fn 10  - Dos 1+ - Close File Using Fcb                              [D]

   AH = 10h
   DS:DX -> File Control Block (see #1034)

Return: AL = status
       00h successful
       FFh failed

Notes: a successful close forces all disk buffers used by the file to be
     written and the directory entry to be updated
   not supported by MS Windows 3.0 DOSX.EXE DOS extender

See Also: AH=0Fh,AH=16h,AH=3Eh