Have you ever been doing a screencast, (or watched a screencast), where most of the video is the screencaster explaining what mouse and keyboard buttons they are pressing at a particular time?
This is where key-mon (short for keyboard status monitor) comes into its own — it shows exactly what keyboard and mouse buttons are being pressed when you press them. No more explaining specific key combos over and over again!
Before doing a screencast, you just fire up keymon, and be sure it is visible in your screencasting area, and it will show whatever you press. Pretty nifty!
To install key-mon on Fedora, just search for it in the Software application, or on the command line, run the command sudo yum install key-mon.