What does the K key do?

I’m trying to figure out what the K key does. Based upon this link, http://home.iae.nl/users/exwhale/bweb/hotkeys/, it is supposed to turn the Object Toggle on and off. But nothing changes when I press K.

What does the K key do?
Is there another way turn the Object Toggles on or off?


it turns the KeyFrame representation On/Off.

If the object has keyframes, ghost objects will be put where the keyframes are.