What is an alternative approach to implement screen control similar to Pupy, and what are its limitations?

An alternative is HTTP-Remote-Desktop-Server, which uses a Python-based Client (with PyGtk and pyautogui) to capture screenshots and execute commands, and a browser Server. Unlike Pupy, it requires manual refresh to update screen content (no streaming) and uses uncompressed PNG screenshots, making it less efficient but simpler for secondary development.