An application to receive spoken text in hexadecimal, and post keyboard events to the frontmost application. (It was supposed to behave as a serial driver and communicate between any two serial apps, but time ran out.)
The demonstration includes driving one Mac from another via the microphone, RCA cables, walkie-talkies, and tin cans and strings.
Uses Mark Alldritt's Speech scripting addition, from the LNS Script Tools collection.