Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 21h Function 68h
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  Interrupt:   21h     Function:   68h
 
  Title:       Commit File [Version 3.3+]
 
  See also:    Disk Reset
 
  Description:
 
     Forces all data in MS-DOS's internal buffers associated with a
     specified handle to be physically written to the device. If the
     handle refers to a file, and the file has been modified, the time
     and date stamp and file size in the file's directory entry are
     updated.
 
     Input           Output
 
     AH = 68h        If function successful
     BX = Handle       Carry flag: clear
 
                     If function unsuccessful
                       Carry flag: set
                       AX = Error code
                                    -♦-