Guessed right but for the wrong reason.
Must admit, I don't quite see the point in teaching us about a feature that most of us have probably never heard of if that feature is deprecated so we won't ever use it...
You could learn it in case someone else used it and you encounter it on a database that you just started to work on.
I learned about this when someone asked about it on the forums recently.
Luis C.
General Disclaimer:
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?
How to post data/code on a forum to get the best help: Option 1 / Option 2