Around @11:16:

"What made HyperCard the ubiquitous product it was in the early 90s... was the fact that it was included free with every Macintosh sold. So anybody could use it to create somethnig, then share their creation with somebody else with the confidence that the other person would be able to run it."

So that was in that day. What is the box today?

Let me ask it another way: What is available on every computing device[...]?"

I would encourage us all to find ways to make the system immediately available to users.

Good example of why leveraging the browser's runtime is better. i wouldn't have guessed that the md2blog creator was using Windows. (And I didn't. I just assume that everyone is using a Mac, even though I'm on neither.)