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

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INT 21 - CED - INSTALLABLE COMMANDS
        AH = FFh
        AL = 00h add installable command
               BL = mode - bit 0 = 1 callable from DOS prompt
                           bit 1 = 1 callable from application
               DS:SI -> CR-terminated command name
               ES:DI -> FAR routine entry point
        AL = 01h remove installable command
               DS:SI -> CR-terminated command name
        AL = 02h reserved, may be used to test for CED installation
Return: CF set on error
            AX = 01h invalid function
                 02h command not found (subfunction 01h only)
                 08h insufficient memory (subfunction 00h only)
                 0Eh bad data (subfunction 00h only)
        AH = 0FFh if CED not installed

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