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

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INT 21 - DOS 2+ - QUIT WITH EXIT CODE (EXIT)
        AH = 4Ch
        AL = exit code
Return: never returns
Note:   unless the process is its own parent (see AH=26h, offset 16h in PSP),
          all open files are closed
SeeAlso: AH=26h,AH=4Bh,AH=4Dh, INT 22

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