What is 'Kill Ring' in XCode?

In XCode there's a really neat feature called "Kill Ring" which I get a hint what its about here but I don't know how to use it!!

H开发者_开发问答ow do you use the "Insert Kill Ring" feature in XCode?

http://www.rattlesnake.com/intro/Yanking.html#Yanking

It's from Emacs.

Basically it's a list of copied entries which you can pop down through. If you've used later versions of Word or Excel, they have the same idea in their "paste lists" that show up when you copy things.

It allows you to copy two things in a row, then get back to the first thing.

If the article Customizing the Cocoa Text System has anything to do with it, then it states:

“kill ring” which large deleted blocks of text get copied to

NSTextKillRingSize apparently sets the size of the kill ring.

Please read the above article, you'll probably understand it better than me.

This article at Cocoa With Love goes into how to use OS X's kill-ring and other advanced editing features to great benefit.