What are the implications of the Old Man's nickname of "Semiramis" for the Old Woman?

How does the presence of Belle and the Photo-engraver affect the Old Man and Old Woman?

Whatever the Old Man's message is before the Orator butchers it, most likely Ionesco did not plan for it to have a specific meaning. He purposely leaves it vague—as a compilation of the man's "life" and "philosophy." However, the man does say he has invited anyone who is proprietary and intellectual—which turns out to be anyone—to hear his message, which will save humanity, and we see that an Emperor rules over everyone. What does this say about the possible underpinnings of his message, especially in reference to the word "proprietary"?