INT 21 - DOS 1+ - CLOSE FILE USING FCB AH = 10h DS:DX -> File Control Block (see #01345) 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 SeeAlso: AH=0Fh,AH=16h,AH=3Eh