Saw this ;o
“In regards to phpBB hacking your forums means you will modify the core files of your forums so that it will before different features… an example of this is the [ s ] [ /s ] feature of aaNet forums which lets you strikeout words. That doesn’t come default in phpBB but has been modified to include such a feature. “
Probably standard in newer versions of phpBB by now I guess, that quote was circa 2005, so i’m guessing as the copyright at the bottom of the page is 2005 then it’s for a same/similar version.