Exceptions to actual links after the forums backslash, such as index.php.
The nofollow puts the entered value after thehelper.net/forums/, so say if you put index.php:
[noparse][nofollow=index.php]Forum Index[/nofollow][/noparse]
Then it will actually lead to the index of this site...
[nofollow=index.php]Forum Index[/nofollow]
At least that's what it's supposed to do. However, it appears vB has a special use for that thing so I guess you can use it for local things like someone's profile without having to type [noparse]http://www.thehelper.net/forums/[/noparse] every time. Or, better yet, ignore it.
The rel="nofollow" tag tells Google not to assign page rank to that link. When the Google Spider comes to your site it is supposed to disallow any links tagged with a nofollow as far as giving Page Rank to.
I do know this - xenforo dropped the ball by not keeping the vbulletin reputation comments as a feature. The loss of the Reputation comments data when we switched to Xenforo really was the death knell for the site when it came to all the users that left. I know I missed it so much and I got way less interested in the site when that feature was gone and I run the site.
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory