X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos 2+

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INT 21 - DOS 2+ - CLOSE A FILE WITH HANDLE
        AH = 3Eh
        BX = file handle
Return: CF set on error
            AX = error code (06h) (see AH=59h)
        CF clear if successful
            AX destroyed
Note:   if the file was written to, the time and date stamps are set to the
          current time
SeeAlso: AH=10h,AH=3Ch,AH=3Dh,INT 2F/AX=1106h,1227h

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