X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 16 - pc tools v5.1+ desktop api

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INT 16 - PC Tools v5.1+ DESKTOP API - ALTERNATE INSTALLATION CHECK
        AX = FFF1h
        BX = 0000h  leave ??? flag as is
            nonzero set ??? flag
Return: CX = 5555h if installed
        DX = 5555h

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