INT 21 U - DOS 4+ - COMMIT FILE
        AH = 6Ah
        BX = file handle
Return: CF clear if successful
            AH = 68h
        CF set on error
            AX = error code (06h) (see AH=59h)
Note:   identical to AH=68h in DOS 5.0-6.0; not known whether this is the case
          in DOS 4.x
SeeAlso: AH=68h

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