INT 60 u - HP 95LX System Manager - DISPLAY THREE-LINE MESSAGE BOX
        DI = 0F09h
        STACK:  2 WORDs unused dummies (for calls from high level languages)
                DWORD   pointer to first line of message
                WORD    length of first line
                DWORD   pointer to second line of message
                WORD    length of second line
                DWORD   pointer to third line of message
                WORD    length of third line
Return: ???
        STACK unchanged
SeeAlso: INT 60/DI=0F03h,INT 60/DI=0F04h