Bloginfo Parameters

Hi,

I wwould like to know how I can add my own parameters for the bloginfo function.

like for instance we have bloginfo(‘rss2_url’) but is there a way I can make my own eg. bloginfo(‘forum_url’) and define it

That is only an example.

I just would like to know where bloginfo parameters are defined and where they can be edited/created/redefined if possible

Thanks