X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 2f - multiplex - swell.exe

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INT 2F - Multiplex - SWELL.EXE - INSTALLATION CHECK
        AX = CD00h
Return: AX = 00FFh installed
            BH = major version
            BL = minor version
Note:   SWELL.EXE is a TSR which swaps programs to disk when they EXEC a child
          process with INT 21/AH=4Bh

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