As you surely noticed, the page wants to send you a cookie. Against the rumors, cookies are just plain text files and bad not all. And our cookies can only be read by ourselve.
Wanna know which information is stored in the cookies?

• No Cookie saved

Cookie	Usage
YumeLng	Saves the used language. This parameter is like the language setting in the page URL but some germans had troubles in the past because of different language settings in their browser's configuration. So, if they entered the page it was always in english. With this parameter they can set it to german for ever
YumeDesign	As the name says: this parameter defines the visible design of the page.
phpbb2mysql_data	This cookie is from our old bbs and no longer in use.
phpbb2mysql_sid	This cookie is from our old bbs and no longer in use.
phpbb3_rth5y_sid	This variable is set by the bbs. The Session-ID is for security reasons and it is used for the activity of the users in the bbs.
phpbb3_rth5y_k	This variable is also set by the bbs.
phpbb3_rth5y_u	Your User-ID for our bbs.
PHPSESSID	That's the default Session-ID from PHP.