Function 10h (16)        Close File, Using FCBs

Close a file and update the file directory, using a File Control Block

On entry:      AH         10h
DS:DX      Pointer to an opened FCB

Returns:       AL         00h       If file closed
FFH       If file not found


Notes:         If you're closing a file on a floppy disk, DOS
attempts to determine if the disk in the drive has
been changed, and returns 0FFh in AL if so. The
determination is not reliable in versions of DOS
prior to 3.0; using this function in DOS 2 when the
disk has been changed may result in a trashed disk.

See also: 0Fh
See also: 3Eh
See also: FCB

10h (16) Close File, Using FCBs