Am 06.06.2012 11:29, schrieb K. Peachey:
CentralAuth uses it so you can refer to a user on
another wiki when
you need to do global stuff.
EG: TStarling@dewiki or TStarling@enwiki
This makes sense, but I didn't know.
I suggest, you please add an explanation as reference on the pages
+
https://www.mediawiki.org/wiki/Manual:$wgUserrightsInterwikiDelimiter
+
https://www.mediawiki.org/wiki/Manual:$wgInvalidUsernameCharacters