From arstechnica.com
Sometime around 1988, my landlady and I cut a deal. She would purchase a Macintosh computer, I would buy an external hard drive, and we would leave the system in the living room to share. She used the device most, since I did my computing on an IBM 286 and just wanted to keep up with Apple developments. But after we set up the Mac, I sat down with it one evening and noticed a program on the applications menu. “HyperCard?” I wondered. “What’s that?”
I opened the app and read the instructions. HyperCard allowed you to create “stacks” of cards, which were visual pages on a Macintosh screen. You could insert “fields” into these cards that showed text, tables, or even images. You could install “buttons” that linked individual cards within the stack to each other and that played various sounds as the user clicked them, mostly notably a “boing” clip that to this day I can’t get out of my mind. You could also turn your own pictures into buttons.