At ThinkLABS our end customers are children who use our Robotic kit in classrooms. In India you will find schools running Windows 2000 , XP, 7, Vista. Computer Lab may have a network, and not necessary all computers have internet.
The Second Generation of Visual programming language that we are working on unlike the previous one CiMPLE is not a native application. I have looked at frameworks that allow web apps to work on desktop too. Google Chrome Packaged Apps is one such framework and most promising of the lots. We are not using it. Why because it doesn’t run on all windows OS.