What’s it for? It’s always gray.
Highlight a function you don’t know anything about. Then hold your breath and the “4”, “0” and “1” keys while right clicking on edit > usage and you will get an encrypted connection directly into Jan Blok’s brain. At which point three wishes are granted to you. The only rule is that you have to include the word “beer” in each wish. (Depending on the time of the day, your mileage may vary.)
Sorry to put a downer on David’s post but I have better results with the combination “5” + “0” + “4”!
Give it a try!
FYI. If necessary, one can access this programatically with “eUsage( 5,0,4)”. You still have to hold your breath whenever the method including this code executes, though.