system software: A miniature program, similar to a desk accessory, which is run by holding down the Command and Shift keys and hitting a number. An Fkey can be installed semi-permanently as a resource in your System or added temporarily with utility programs. Your Mac comes with one, Command-Shift-3, which takes a picture of the screen and saves it to disk.

a little program you can start up by pressing a Command-Shift-number combination on your keyboard

a very small program that relies on old Mac technology

fkey is a scalable finger daemon type server for public display of user-specified files, e.g. PGP keys, contact information, etc. Users edit their data file , and the finger daemon displays it on public request. It may be used as a banner server.