XScreensaver, the Apple 2 and netcat
So, I was playing around with xscreensaver and I found out I could make the apple 2 screensaver run programs. After a little fiddling, I realized that I could use netcat to remotely send commands to it. More fiddling and I had a rudimentary SSH/remote access thing!
Editor's Note: Unfortunately, the contents of this post appear to have been lost to time, and only the opening snippet remains. Sorry about that.