Forum:User name in link

I know I've seen this done before somewhere, but cannot seem to replicate it. When you enter a link into the url with something like "username" in it, it would input your user name there. I'm not sure if this only works when manually placing it into the address bar, but would really like to know what this word is. Note I do not need to have the name actually show.


 * Do you mean something like this? 17:21, August 20, 2012 (UTC)

Nope, I don't need to display it, but rather a word that when the url is placed in the address bar, will replace with the current user. I remember pasting a link into my address bar once (and forgot to replace text with my name) and it change it to my user name automatically.
 * Do you mean Special:MyPage?TK-999 (talk) 17:37, August 20, 2012 (UTC)

Yes, that seems to be what I was looking for, thank you :)