These are images that you can add and tell CurrentKey to display in the menu bar for a certain amount of time.
First, click Add Image and pick any square png file that is between 44 and 500 pixels wide. By default, that image’s name is a number, but you can change it to be descriptive, like “Puppy”, if it’s a puppy picture.
Once you’ve done that, you can run this AppleScript and it will display that specific image for 5 seconds in all Spaces.
tell application "CurrentKey Stats"
display_image imagename "Puppy" optional_duration 5
end tell
AppleScripts can be run/triggered by other programs — everything from QuickSilver to EventScripts. So you can essentially turn CurrentKey’s menubar icon into a notification/alert icon.